Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b572ce5bfc8371…

MALICIOUS

PDF

90.0 KB Created: 2021-07-07 03:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e58e2db84222a340fc54a1dd0435bb0e SHA-1: 1e1f45f804dc96da05e94f3a76dfb37d0a3d73e2 SHA-256: 42b572ce5bfc8371258507f956c1e329af8d0d248c57a86435005d400ec290da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The primary goal appears to be directing users to malicious or phishing sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://tunglamgarden.com/images/fck/file/83999772621.pdf In PDF document text
    • http://rspon.pl/images/wyswig_images/file/nedobowotuwazavebudiba.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/bebaxinulakunusobikivu.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/kipedotafonaliwoboveb.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eed5d2610---9651128431.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff80a2129---20368391050.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/37223782459.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/jogobovoboforovetevivu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8af7ab4c---76754449722.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/76a7vadprri2f2qcq9e2l1ea55/26277576203.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/57051745130.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sg888r75rkg912nk9i43dd9c51/58946804301.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd07945f7d---daxegixaposolejupir.pdfIn PDF document text
    • https://melz-feu.ru/upload/96708443144.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/329376f587406b33df4c3bb1b8446ab3/xosuvokubebaxu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/39549820571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a10276627---17327188392.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9330e7b991---55876704492.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081032edd486---kudixovipebixamu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb28251a7---dojetilediwo.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/49467396603.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/pigisibesomowadopibane.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/031d04fea556a21801e633b21507282c/24619423114.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/15793797997.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3739b3e4b8df50115cf5c131a2817544/414970529.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/29045725588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+1+clash+of+clansPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 17736 bytes
SHA-256: 60d88c645a9681177ecb9e94a2d720a03ed79e1a8756003f820856d67f630be3
font_01_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 10376 bytes
SHA-256: ea18db080f38ed77740c19ca94ebb69d6c6e4f548546d42b449e0a64d0edf7b2
font_02_sfnt_off00013a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15212 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7