Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd91b466ab0685ed…

MALICIOUS

PDF

78.8 KB Created: 2021-06-27 22:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 311c502108d6d64fbd0889d0ba477430 SHA-1: 887eb9053db210de86e814033d793eb222ac0cb8 SHA-256: bd91b466ab0685ed98d24380b4e591b625573aecfc867de1b5ba0c5dba8c2be8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69629091740.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d5515aada1e62ec2790b92e9fc1be287/kumepilututiwatake.pdf
    • http://valsadindustries.com/userfiles/file/vijexuzug.pdf
    • https://anmimar.com/royal/userfiles/file/53450202273.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/buniwurebavelumuxoxu.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jhlc6hejm2enpf1a8cve6cujm1/jewimokatafuzumukufez.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ddc2df4b9315d3d97f472461303925df/xekigesiladosuli.pdf
    • https://bruceleevideos.org/images/file/59652010080.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/gibarematunatikut.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d9ba5d4e6a3aaa95b98b392804f2d3ef/sulerese.pdf
    • http://bronia.org/userfiles/file/25480894239.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160800909c6bfa---mazufurebopimemitukozer.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609103e29bd71---mewiwikunile.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b56bab4b400994ac0a0bca36ea550aa3/bemavek.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d0c12526---pezovoguliramomex.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17a864bda---fizimikugekalodinokodagax.pdf
    • http://ridendo.cz/files/file/ginegulad.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c341cfb2---7232258240.pdf
    • https://suma.ca/upload/editor/file/xezoduvinizigipawudigefo.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe2c21faf---xusiko.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607426e660fe5---47113106431.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xanarolixujemimumi.pdf
    • http://apexibd.com/uploads/fck_uploads/file/jazowonuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=once+you+have+shingles+can+you+get+it+again
    • 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_off0000d260.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
font_01_sfnt_off0000ea72.bin
24e58df009d579c46b56395e271a767c79bc91276984635e2eaa81290e30ef0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 16508 bytes
font_02_sfnt_off00011500.bin
0b335de7999b679672a7fe08a3cf442b010fd728c2a5c0071cd631b482a01b25
pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 10712 bytes