Malicious PDF — malware analysis report

Static analysis result for SHA-256 63986c6eacce197f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-06 21:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ca11483497b6b993283f145e4c218b49 SHA-1: 7ff67de6d37770f6a0f30530bc388f9e1fefac19 SHA-256: 63986c6eacce197f0c5739c6a77c2ee4c80ddb8a6e6b55fba8d1e364b0dec2d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis reveal a pattern of hosting malicious files on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tmes1trec8kv3lo77uu5g7i5ch/fumurulisa.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d88906ed5a---wujinowivekikalurulowa.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/59246187329.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c6435b1444b256395884fdc433db7e0a/26582383841.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/61008629423.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/58e02822efe4045e043c5e2f6c7ecaba/nufirisezenelukatabowib.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8681396171---59054658635.pdfIn PDF document text
    • http://zubrcup.by/files/files/22584258154.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/xosedasapaleloxasafegedu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160776dea1c80b---zarepotajutavozuritase.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6dc0ccc14a7d81e051e5d9ab1c17a58c/2662649258.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/walejijamijudosin.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/ruvovopazimog.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/de17bd2a3bcae184a91517d373353be8/tamotalapavisuvis.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/18e00389d34c81ef13539a59621be3bc/89292247235.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f7f807779022d1a251f760ec727bc1bc/50040756419.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbcfdefca---9518585269.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/96332359285.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ea09a17e2595e54a01576a48415cf133/64997062407.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cad4ac8bbef8d95ff721daf128f160e5/vodisenoxunifidonipowibe.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/pufisadubuluxutigu.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/tumofemonavobizavafipeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=horse+opera+crossword+clue+7+lettersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 18888 bytes
SHA-256: 33a13d6f4f230513e86c927836937b2a210d2b3d7a93df916281c1b43eda8756
font_01_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 10540 bytes
SHA-256: 8f55319e60b1ed84ca1570b0ba640036fcd212295f6079fddfc68a1432534b97

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