Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01fec3d26b7db51…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 13:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c700b6460227821c8c1f86df66afa98 SHA-1: a8c3c27b1c88a203af6b2352b0aaf38cb940456d SHA-256: e01fec3d26b7db517b3d1a941baaf6215e579b7aff0529569f059cb454041669
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or acting as a link farm, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pretext, aiming to trick the user into interacting with a malicious link or service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 https://infrive.ru/uplcv?utm_term=geometric+series+examples+pdf PDF link annotation
    • https://bawaniint.com/ckfinder/userfiles/files/66189174478.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kqvi1h9ofskp3ler7ssege92l1/15445145531.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/56498053721.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/10439008278.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fakevutulo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fb38fa8b6tv4t2f7n60oe4cac7/32470109303.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1a176b092fdd2fd8ef071d17da379f1/zesuporaravepoxidifotoju.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7d56839cf43d4e5a5c9513c43c4b13a8/rejefeb.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/42365332427.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/40555542306.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22455493059.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/15975671462.pdfIn PDF document text
    • https://ms01bet.net/contents//files/33387817652.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892a2fc483e---wiseparekabumubipuwi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d190c34212---redesisekomuzetosigedas.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m6jbh6ur48uu2d341uqj8af5o6/97208810160.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cc9f639ce138ab15c3a7563471439e27/50026681571.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/bm0slriljaphqqmn043slir505/24295714865.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077653dc81fc---37064752044.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857970a6010---ridutaxufezitigoli.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/42640409049.pdfIn PDF document text
    • http://akssert.com/userfiles/files/91737294646.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd9rfqp7p1knc28s90j169q9qd/32782670898.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/59966464517.pdfIn PDF document text
    • 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_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 17504 bytes
SHA-256: 3c2357c61e504e1fe7ce751fb9d499be5603677905d33c234ad5e4324bdddd1e
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 10816 bytes
SHA-256: 498478bb129572cfc692f4818f7d92f31bb8000c00a2e63712073425f774cee0

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