Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87e7c9db22ac582…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 06:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ffc477530e4b226306aa6036e38824e SHA-1: 3fb71ed4fd2cf43c3595b7fe4c748d4e399438b1 SHA-256: a87e7c9db22ac58207a1c449b0c531be28a7da27db325af101eda5562b788a91
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score point towards malicious intent, likely involving the distribution of further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://thankschicken.com/uploads/files/gujinukit.pdf In PDF document text
    • http://fruitsad.pl/images/file/2726017820.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/rewidorez.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/vugililowixegetamekur.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/jujavetaronenafuxazevilik.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/ritojolutu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/piviludifupedokusazotu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zujefimejinape.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/77105007781.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/towopil.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/buvakadoluvibusemivodixa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130458a0fe6d---xavabekaxunuxukeped.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/52332327912.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/koxelusokoxagi.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/65815855855.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210910124247.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/043c471353cdcd03994d232805a62ff7/jobavudilakadilekuboza.pdfIn PDF document text
    • http://mobilenmr.com/files/files/buzudejadoliwonu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/tutas.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/wuletowijo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d94e9d9f9---xasuso.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/fesisazoxufer.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/28604755066.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/muginigisib.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fg21fu9r3ac1ltc5i7t9ea3217/97131779704.pdfIn PDF document text
    • https://chineseclothingonline.com/File/93831604717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+quiet+place+part+2+full+movie+for+freePDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16868 bytes
SHA-256: 79a6e2b3b7c7a74abecb22012f770b1aafc781892629697a45c82156462af2a7
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 10784 bytes
SHA-256: d2de8fb29339bd058695b6062d4271cdc8f46bb5d8c054bac68f285f0790dce6
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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