Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8de8e9ac13ddd3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 17:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97ecc3654d9812ce1f120dbf1a7b8858 SHA-1: 08c223040a172e93f9118ec40d970f00ed0ffeb5 SHA-256: 8a8de8e9ac13ddd34f8ca286fb14ef4501d6de5422c94763b9ea6b41afea94bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are identified as link farms hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb310be520---3493067423.pdf In PDF document text
    • http://flyingkirin.com/uploadfiles/file/021009069802.pdfIn PDF document text
    • https://fobh.net/userfiles/files/foroxavuzadozobu.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/58830956434.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/barapumiwekinofabora.pdfIn PDF document text
    • http://elpijisystem.com/file/bakuwuxotirerawibi.pdfIn PDF document text
    • http://meditopthailand.com/file/pivoxiratugedukepid.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/lomemataki.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/54992183461.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/92543905025.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/20575875792.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/mufeligigejidekipe.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/xetob.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/posekijemubanaxowafu.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vanep.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/2635957392.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce1200dac---jazuleta.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tukarerufadikivotorala.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613455e9e7d8d---43970764710.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/57928564076.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33902f59d---gopavuvoki.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/57984919626.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/69109171149.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/lalit.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/58794124842.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/47275858840.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/zaduzekef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+pokemon+soulsilver+on+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE10 17168 bytes
SHA-256: 2e0f11f02812c4cf89c2c002b59dfe7e3e40e78b0b724bb6e5acac6a5437621b
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10888 bytes
SHA-256: 9b804fabfa0a4063a79d7bf3bb89f3a8ba757b448c338e04bba9eafae2668e9b
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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