Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4700a683237c20…

MALICIOUS

PDF

74.9 KB Created: 2021-06-28 21:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f43cc25f7b2bb47fb20edff4527cdc80 SHA-1: c03d400461039bdd0b68f82fae2b42a16ef0a2d5 SHA-256: cd4700a683237c20ad52733eee4deaa54c74b23139e83233ead5a4a31e3b8753
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations. The ClamAV detection and the nature of the links strongly suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2161

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=scalded+beef+tripe PDF link annotation
    • https://cometsecurity.in/admin/userfiles/file/zanugag.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5gtluss20ff8ou6458fqvnovpd/duradelanavufatojevike.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b414defb45---mubag.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaf09eeac---vobonolo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/io1bnv4on3n9kq6li6e7nngau3/46190201888.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/19266236379.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842e659171e---vatinunelavivixinejapiteb.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/zalavupakobamu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2065b1745ffd48f1f4068bde8e504e93/16174478907.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5g8k4r4b0i07h9ansel2jsara5/22972663219.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/volijibaronosogukix.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71e4b015f---32382524927.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793ca0ed430---firupirixivukerig.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/76599979239.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075daae53112---2436390747.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d8f0eb3edd65484d279c52f041852eaa/lewizupukif.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/79357366959.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/47659962235.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/dbcef0ff51f2052948e3b743b3a4c3db/12436234011.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dutipiwop.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/padajalogokodizibipalo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021042923192773499.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/621b86ab7d3c2d5d9d226b22249350c5/jonedakaxorebirugiko.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01993e072---59141533831.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2aae01d7---8327722310.pdfIn 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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 16404 bytes
SHA-256: b415272b154606c19535a9b1d5f873d939d7c98382cf10720c842b0259e6d30e
font_02_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 10436 bytes
SHA-256: c147c92844e56619ffb93340f8822cf7b364ca4ccbeac5573b54168bde069b84

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