Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2278a0541a3cfaf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 23:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4413d422420c7d725f06940bdb07c6a2 SHA-1: fe7531deead1066a6ca3143341339ccdddf77565 SHA-256: b2278a0541a3cfaf6f690a9c543503dd2c60c1123d965fbdc4bee91a747cf351
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and potentially disposable hosting. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, aiming to trick users into downloading further malicious content or engaging with a scammer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9ff39bf5---lewuruninazeropawu.pdf In PDF document text
    • https://linhquan-group.com/upload/ck/files/tawofu.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/farogevasetupolutozugi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611861d8f34f5---92262877835.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a5aedfb5---waxigew.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/98078966720.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/gobexutojedixesusi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608413a109c05---lufelimaribotu.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venizuvadivijotupenuro.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/13138360556.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5i65p1i0lrt4i217ojf7aae6e9/lovozogekorovirepab.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/genivemafufisekul.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210624190831199.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/wurokuvugerilu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e1a8731e3e7bfe75f8d680a6784b6d3/82692376486.pdfIn PDF document text
    • http://gyobel.it/public/file/95906562137.pdfIn PDF document text
    • http://talleresjpg.es/img/file/bukisotuxefawujebupu.pdfIn PDF document text
    • https://htchninc.com/d/files/mipokivizusedubazabuvur.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/judipanejosofepafarodarap.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kuzudutumarutilelixupov.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/60602551738.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b029e2202a9a271da660687f1419c157/dejupetibodogemodakugoji.pdfIn PDF document text
    • http://idcla.net/upload/files/88251230576.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0947e36013cfa984ddddcbdf1c9c8fc4/47140149027.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0541ac42b04e7ba10b3e8c041a93bd1e/dakumiguxubakixiwobaxa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fdc07d28a89b1b57f9ccbcaa58009787/77003373668.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/etrubifft329b53p0ggaveq1p4/40688047450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=final+fantasy+iv+the+after+years+dsPDF 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16912 bytes
SHA-256: ea9a262a04293b94b88fbeee0a950e74a89d9a9adef8aff9bd317982ea6ee62f
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10488 bytes
SHA-256: ab973f8f7ea425075cf6a23b87cc3fbf596f281f86dc889ca3fceeca3694f67e
font_02_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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