Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1872f0ac05a0462…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 23:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b816326ee5b0c9105253a9ae88221798 SHA-1: f0f58cd35473f1f00abdfeebd5744df9a867acc8 SHA-256: e1872f0ac05a0462b498bed244e1d5835ed85fcde712300daa43ddd5eecc1b24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. Numerous heuristics point to the PDF containing a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://shepardfarm.com/clients/877021/File/tuzifamijugufukijizinabem.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e9bd5b1f133c4ec60eb2528cdfefe5e2/32106386549.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a52bb3fae---462296628.pdf
    • http://monroehighwildcats.com/clients/40160/File/fedakupanofaretuk.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i1q4nvkhhmgsrpq5rop6006neq/mumadokerimuzofovose.pdf
    • https://angkalaris.com/contents//files/90697010087.pdf
    • https://fzclicks.com/demo/files/editor/file/figumowixusalevasami.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160af52487eb92---zepodevofujonazedor.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2eac99158---besikeg.pdf
    • https://b2cexpressdemo.com/userfiles/file/buzarivurivulipewujuzobe.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3cb7696e195e8d49b3573dd72a137e06/zikizewigabitarutesubufus.pdf
    • https://keluargamimpi.com/contents//files/73609207656.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8a5d35454---vosepotetaduwimewafap.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/wubuwoperufakiminududitag.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8eeb2c83e8f510e8bfb480c54a65a3af/miwaligobosikijuzoferamev.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xiturewopexofedir.pdf
    • https://akproauto.net/nbloom/fckuploads/file/gibudot.pdf
    • https://novamakine.com/upload/ckfinder/files/38609415714.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a83a0814e---37456129942.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2cacbe62f3fdacfafcb963e74f736916/32303286192.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e48df338d---22174504405.pdf
    • https://ludifrance.fr/userfiles/file/fegopoxiralemu.pdf
    • https://phuquiland.com/upload/files/kuwodisos.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/27f2cb14626cf9ac0535f15c88cfdd9f/46627783659.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=can+you+put+hyperlinks+in+a+pdf
    • 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_off0000f26f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16792 bytes
font_01_sfnt_off00010a81.bin
6c8e6ae4ea789fbcd0fbb5307996cafa49d181b9821b5c29e8a58bc17a978cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 17052 bytes
font_02_sfnt_off000136ca.bin
1df0049512fcb6530dfc39af49156c1731b1738d9fc00b5a7a1f6785d132515d
pdf-font-stream PDF embedded font (sfnt) at offset 0x136CA 10932 bytes