Malicious PDF — malware analysis report

Static analysis result for SHA-256 1217a7d4c3bfcd1d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 04:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1e36594e4be1d6fa6e944209f82017a SHA-1: ae6bcfd33c6102337b957009e5f0f7d7d1212c49 SHA-256: 1217a7d4c3bfcd1da0961701f818ba9419c49f9f2b7fde1c9464cb70285cbd3f
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of urgency and callback lures further supports a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://automsystem.com/UploadFile/file/20210702081357283.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/wimoxibudaraworo.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/bisekizosorexovugiteso.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/redagobipomatimibugero.pdfIn PDF document text
    • https://j26clean.com/upload/files/vevotuxokivaguku.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/38125232142.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/loketosaberiwekaruvura.pdfIn PDF document text
    • http://apcmagon.com/userfiles/91043794189.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ot0l698ghr521ff6l3bge6h9i3/goxoralesodipolodolipun.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/77802279399.pdfIn PDF document text
    • http://afslab.asia/upload/files/52859923376.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/sexisezow.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d290f306d4---61459578854.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/67656165208.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/53097153286.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/oqjlhahrtkt7ue7lco2fpq2262/62652522217.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/58acf58f88035088ecdcd1a949b75f41/vupitadogufusadevubakilad.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fb335e77427700ea711e8d77a688debb/pivuzezamemuzu.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/26381577876.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090211034048.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/rikemovefogiper.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/67418488145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=couch+to+5k+pdf+distancePDF 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 18352 bytes
SHA-256: ea1e06c7aaf334567d131315e8867d83ab1d3544b2c95527f82875c109f1368f
font_01_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10928 bytes
SHA-256: 3632e40d2f02cafdc91a77b7b83535a56e49b0c472790026ebda8c0ea9309bbf

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