Malicious PDF — malware analysis report

Static analysis result for SHA-256 0338d82b3087a47d…

MALICIOUS

PDF

104.4 KB Created: 2021-07-05 22:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7870d7d12905688e0a4ffb0bee90c815 SHA-1: 16f1826555f68349db62da3885add2c6b8fdd729 SHA-256: 0338d82b3087a47db6791754d2f6eb2993e795c358c725f91ff4a82778f0d613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, which are often used to host phishing pages or malware. The presence of these links suggests an attempt to direct users to malicious content, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9257746480---21988810031.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be05017dcd---70677157267.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/67905820714.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/57930503218.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/58530193434.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/pamumaluko.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/brc8cv4cbv33s4jk5qoj4ha7dc/wogijifodidujuvaw.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/s5gm7e2m3ucn82hd3o5dcpnjov/33858044616.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/mv82on113nernhk6eectfa9ab1/88318266036.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8ac60199---gazenosaziguvidefe.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1ca75064cd8061b5ee3d50e92eb5c330/gapoxe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a784243e114---18212193639.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16229199607487.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5694973fb4---romiwawedikisa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae6aa5e04---60315213723.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/45917986266.pdfIn PDF document text
    • http://congtyrongtien.com/upload/files/77187645308.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4091b81fa973662d938c3809af00bff9/49957327249.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be22db0d68c---86014688011.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d67fa32a0---xipumisujigolaw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960dba8214a---45766463066.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609608e1b3e3b---fufadigo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ea262b6923406b6c5ce95e2954e5d068/tavevizukazamemepevenoru.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/75932136875.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b8cc44b3---pusuwomipowojubib.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a482f59e---mamawojun.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8ef78dd9---rewinabuzuxagukem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=weapon+used+in+fencing+crossword+cluePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 1960 bytes
SHA-256: 12004280ae239eb3797d504d7b64c6ca2b7a4b18d6d7d5898cff836f647a5fef
font_01_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14895 19292 bytes
SHA-256: ee0a7d46a4b32f693bdfb7eed72a11ab2cba39e36216375a6bdc9e849d7e3aa2
font_03_sfnt_off00017a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A3D 10876 bytes
SHA-256: f1d24b5411b7e1c17ee07ebe1d91591fd55cf2ebb6c5b3137d170ec91807427a

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