Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ed78d89913f711…

MALICIOUS

PDF

83.0 KB Created: 2021-06-29 01:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ddec65ac30e36e358bd3bb5b82303e1 SHA-1: 84faa2311fd5c3f377896aa69701ce9b2ee02038 SHA-256: a4ed78d89913f711d9aa45c312759e4a3baa3c494b17f8e7d879be1d623b1d53
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt designed to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9bblfbo72e3ub034fja78gdha4/63364104736.pdf
    • https://dotcomtravelegypt.com/userfiles/files/fopitejategako.pdf
    • http://srividyaastrology.com/userfiles/file/52347789072.pdf
    • https://scavilecis.it/userfiles/file/22533333981.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4molvs970p75fuspiqoasuaple/waviriwijovixinunu.pdf
    • http://cuboni.com/uploadfile/hong202106270303259211.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cae8d8ce5---84861363643.pdf
    • https://tcremich.lu/files/files/zojosuxate.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f749f00df5---76673879489.pdf
    • http://loaamtran.vn/files/usersfiles/files/84671874431.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/40746503916.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a99234bd4---88518473198.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/00adc0ab599ddf43004324edbf63911e/finuk.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0e6c91a5---93967592830.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/ketewekabur.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c63ec2c25---lunuzanofuwesel.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/97491494107.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0935ddfcf---96913123386.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3603b588592cdeeeab9732632475415b/xeronizale.pdf
    • http://kaupa.cz/userfiles/file/77835162958.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8d8e2879---webigibopudof.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607722aa723e6---24797117202.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unblock+number+in+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16792 bytes
font_01_sfnt_off0000f98e.bin
b954d7216e00afee7169ca5fc47ec311ba4d36aaeb4b9d0936b79de5c2ccb424
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 17200 bytes
font_02_sfnt_off0001268b.bin
7ef6d32b8431c7c0976c698bc2dfb439989d59ec57f4d933f283a300ff633fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 10720 bytes