Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ca54afbc2e2202…

MALICIOUS

PDF

87.4 KB Created: 2021-07-19 03:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bf7d9d273645bc4fbcbc7fb7f9ed2ab SHA-1: 4cea10b227f56c0f87d50984c7b6a7a2b5585373 SHA-256: 54ca54afbc2e2202f8b511d27903d180503b996018fd15d36d471d29bd8b379d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ccc67b50---35886155243.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8236869a---fuxupepejarajefupoga.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/49114046708.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/10636445844.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1625640374.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5fa0e6be3a7894da8e5f848ebdc84e09/nezazab.pdfIn PDF document text
    • https://dhesient.com/media/miris.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c553668e226---lugirigipovaxelerokadev.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/walutubetibefuvipide.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/54200190843.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1vblu4lvpt746f5p4mk97proqv/nerinorivemejubodivoboner.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/faveze.pdfIn PDF document text
    • https://actor-conseil.com/files/file/87897910316.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/86561362566.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c7c35497c---wufeziwudazilibe.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/4690034512.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3d5c68f0---joxawufunuvovuvu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f9qdhsgr7a5ihhkqa83u810702/9507839365.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/4834315227.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/93464911560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=no+guideline+8+ball+poolPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/85268780462.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/348cdcc5736364a198835bc673509f02/jewupobevenadi.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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 17256 bytes
SHA-256: afef18ec12e60f6d4879b5ddc12cfd16863ae3a0ae7d9e78cad093bd7b083646
font_02_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 10624 bytes
SHA-256: 3079e5cf2a401456b35773ca57837ff204c1ddef7660607f8d8d0a4191805805