Malicious PDF — malware analysis report

Static analysis result for SHA-256 02832ff12cb5fc3c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 16:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55758882f25743ab6a25d71e95a2b679 SHA-1: 6a1997e3149377ab54058a5a6d8e55c75977491b SHA-256: 02832ff12cb5fc3cf3e41129262d92a2d7615402de981461fb59c9824e04b91e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and callback phishing indicators further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=tower+root+apk PDF link annotation
    • https://ehlibeytalimleri.com/resimler/files/ketifemifuwufegatijubox.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/61316695362.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gapawo.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/92700910459.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/81991780126.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc200c86e---52889131338.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/28294003940.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/risaxadexasipe.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/76627090297.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631523035_0abde7764d.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65cb6af52---zonavulugepi.pdfIn PDF document text
    • https://codecs.ro/images/file/96486243764.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/3025975580.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/45624419976.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/60438483544.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/kizabibumejuxofivurojomag.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/meravafijofagegidi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a6bc2413---bipasepuvaje.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/suwovutekazalupugavezej.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/33403091894.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/wivegujogafilefu.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/fosalorisifupome.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/kinavuxof.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/15907005093.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/5323188329.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/41483725181.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/77832059213.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 19048 bytes
SHA-256: 2561a929adfd64417fb8574ea16f1e0ecb750a5e2d40e45a16895e2603e6cbb0
font_01_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 9976 bytes
SHA-256: 58b285a32ad94d1a6e02e280f46cbc203d63b60b046323b1455e1d388d8286a5
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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