Malicious PDF — malware analysis report

Static analysis result for SHA-256 e168d908f3efda6f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94e4c338cd305aa37503cbc1379c8242 SHA-1: 1cde01cdee1e7ead0c9819c33b4adc0b2e0e759c SHA-256: e168d908f3efda6fed2a6528f05299fdeffba620ece33e730039b4193b413dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious document as an attachment in a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/94bdb9f9476f5af4b3904c286ab45d66/bugudumunonatiz.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755408403d8---81849562432.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/lonobegimukoxofazuvu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/45011624560.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xigepigujiz.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/vubasasogevomopot.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/55720531988.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/91756077147.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/buxubemarasuju.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0e2e049d77105118096580aa7cd417cd/babore.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/vazuxilurupitiwabev.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19916e2c3---febidu.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/napokevej.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72737b4bacba6386cc7a3ad59c833e2d/52874894985.pdfIn PDF document text
    • http://web68s.com/upload/files/bopezuvidatobijo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vojobav.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/86957482102.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/nexodanekukedegivibigi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160df3803a364d---xenukojutawalituzuxa.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/24262354721.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/vijirobarovuxid.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/tuvoxeporigo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1cd1a38058091b7d24ab687212509465/21364273633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stronger+hurricanes+due+to+global+warmingPDF 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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 11220 bytes
SHA-256: 5b95690c66525124fb5829aa223114ffa217109daec1522b36849d8a5d0f6c91
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 17488 bytes
SHA-256: a43e1160391e2f9e56076d0adea1bdfe2bca16968f5b9eafdc2475c28393eaf0

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