Malicious PDF — malware analysis report

Static analysis result for SHA-256 09af644d861ec854…

MALICIOUS

PDF

89.2 KB Created: 2021-08-06 04:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cea80fba42f3e20e2e914d39f962c7ee SHA-1: 95bf68e482437b5e36a0d36d1f2c73f3b34017a9 SHA-256: 09af644d861ec854ca55fc36f3c38adb2f08bc35bc6b3bba49422f4c13e2face
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43416e3f6e---47727242579.pdf In PDF document text
    • http://universe-micro.com/upload/files/20210731_104320.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2da9de40---46997972706.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987b2010d1a---91157774449.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/op2fmabjsvmdudm06fr9olitq9/sosafejukakegosal.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56d972fb25---77965152090.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/69e752c4572180e570b43ace0e0bcdd2/sufuwo.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/65111973464.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210715_6CF2B6A03C93D450.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d139e42b5---23954987044.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/74a1b622c01450618c9e1a7a8de02abb/sebaxonunoruko.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/losofogifiwodun.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/28677132685.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/59802103662.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/wepoxobasemulizo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jcda4h229jpr723cad0b0k3qr/welemagafegutez.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f529bc63ca---betojozexinigi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/7428721487.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/karegufibanotorazilake.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3d72eeca---97915562846.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/raxelanimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+better+aerobic+or+anaerobic+exercisePDF 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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 17336 bytes
SHA-256: 6cda6b83e232a0db0d632191e268869a016132c795050c7839c1247e76b681fc
font_01_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 10516 bytes
SHA-256: e7cdcdb2494658e48a4f5f8573cef1dccb394afe9cf1734e38df2fbcc8100a3d
font_02_sfnt_off00013d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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