Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a045a767a37f53…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66e3979f2af47ca79e688025ba4841ec SHA-1: 0f4da6297a3e202c1eaaa53fdfa85019b5947397 SHA-256: e8a045a767a37f532ad3685f6167270283f6e128e4beaa8e116b466f6096d569
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous URLs, including those pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution campaign. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=us+constitution+1st+amendment+pdf PDF link annotation
    • http://houselandia.ru/files/dofotorujajebenemorifiv.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29165060d---kovijosuregunidel.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/61219217178.pdfIn PDF document text
    • https://peterdegendt.be/file/pamudeseronibunet.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wadamugow.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/12882107094.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432096d193---92071919339.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/bakuf.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/vefigobevegopubusexodewe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a853c7219c9---govebuxel.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8c8bb865---gigife.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c110e42f8bf---jikonizijeril.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jimatazetelolasex.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/33327558928.pdfIn PDF document text
    • http://cecev.com/stockages/files/40716890093.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/20609316868.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/binepilomasejenizezileluz.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/60823754032.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7c3095e74e34fc1620934cd22d2055d8/72716005616.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501070321602542.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae6ec358f---86767714957.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160999b683d2ee---lenaw.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 18164 bytes
SHA-256: cb228d5a1842cd4e05a7d02d1aff54c0b0fce011a847a29eb977589ef344ed41
font_01_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 10792 bytes
SHA-256: f3002947d0b03d9c9715da1b0178460d43f1c81fb298248b32653092193e45d2
font_02_sfnt_off0001353e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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