Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacee274d1a31446…

MALICIOUS

PDF

71.0 KB Created: 2021-09-07 20:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8e3ae956590ad4cab7f39dff2924b09 SHA-1: cac72276ef8f349ca6daec371b6aa5f3bb74661d SHA-256: aacee274d1a31446add091832085a4d2b6ab0d117a1fcc41a7318e9d7a6a4dfe
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF contains external URIs and links to compromised WordPress sites, suggesting it functions as a lure to download further payloads or redirect to phishing pages. The embedded URLs and link farms point to various domains, many of which appear to be compromised or disposable hosting, reinforcing the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://coretry.ru/uplcv?utm_term=fillable+pdf+form+941+x PDF link annotation
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764082b28f4---kawotidejezedesotamufifib.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/lujipafiruzimuxe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c31027174---bunoxubi.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/40597228209.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/kixogumumobejiwop.pdfIn PDF document text
    • http://apcmagon.com/userfiles/bejerevuzeguviresit.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/82031969d7c3245016b21d5f28c075ab/sunujadezobaxogawijos.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d86e873c0---63873696675.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kv8bglkfakui9bv9peajm3ut32/retegobifideti.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bc0a4a99---87453623589.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/1itok73on19pphetop2a9ebmsa/mebusaki.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/53042806035.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jta6pm7rd65u2r4q9o6uv11suu/lubanulu.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/27501660226.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/65c8bc22830bf9ba1e00ad3917dc76f5/mesuvomebefirudedikinu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/retawo.pdfIn PDF document text
    • http://furniture83.com/upload/files/32933235171.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/86d4d88664bcc036b30cf07884fc065b/7691593938.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/56303080239.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/71441415410.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740d57469b6---xugajubegagajujawu.pdfPDF link annotation
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43f92130a---wolajiwen.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/nulitumuxowalirisav.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_off0000b767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB767 15088 bytes
SHA-256: fe63ab6a5d80509bd6eeb7419bf77afe764e0fcd2ddaaa79cd8f48158c0da454
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10808 bytes
SHA-256: bc89ce50d18e4097664ca82d34647426c93a57de55f32a4c07504c32ebfb812d
font_02_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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