Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc32740462b704f…

MALICIOUS

PDF

82.8 KB Created: 2021-07-06 19:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90394aea99c33dff0a0b35197d779f6b SHA-1: 17d9d4b89319a5e3434c18e98a1a469d1921291c SHA-256: 3cc32740462b704f02e23617496ec1e5ee85a82f30cba9aa0132df2d31b63a73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure, consistent with a tech-support scam. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt designed to trick users into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=weather+update+tomorrow PDF link annotation
    • http://phonphangschool.com/upload/files/rixopupexevumeziripa.pdfIn PDF document text
    • http://kasargod.net/uploads/file/josakolelepo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/99891e56007db23d25ff2bb05efa55b0/32243396982.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bb6a3ab965672f279b43f407a6eb2548/nazamesosorasipi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2c19235f62381b29b1129df5f15dc8ee/rozemi.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/99768628497.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0237ab32f1e912adc03dbb44c3b994e1/nibusok.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/bomokivuputavezovos.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c957e7e7ee---3842428617.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35005a97a---22975203236.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021615347302113.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9dde4217f05ce769bd3f9f309efb5e8c/vamabatejokalukizafep.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9e29454919b7e7205b24f3156f127757/78398410533.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb13dc163d3---vutakexene.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/14657179781.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210618_110919.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/7568353258.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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10428 bytes
SHA-256: 771e3fa6dffad5ebf41f52e53340fc6ba3761447d04c8c10838b3005d22932c8
font_02_sfnt_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 17580 bytes
SHA-256: 274ff5bbbd86e41acd7cf100ac9232e91d131af750b1a5d0b13ca61e8f488864

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