Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4142b6e509f187…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 10:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cec9a896a977ddd2461fe5a50e2621bf SHA-1: f2fc85034f7976a87950ee3dcb9f7e585b262514 SHA-256: 8b4142b6e509f187d803ad6d7759aa4a7cf895bbea0c21b389639a9822686592
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress sites used for hosting or redirecting to malicious content. The primary function seems to be acting as a link farm to distribute further malicious payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=test+driven+development+for+embedded+c+pdf+free+download PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e56c1b94fda7a5996db586e91e9092b/dumaguxudatajokenu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pfrd9nanme1hahf5auo58j7vkv/reresawo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aada34ac973---wezariwidogoxipu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/xefutizasosolusajade.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0612053001623039130.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13259577687.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081beb19174c---sirosolasorume.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/75357217147.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xurivimejijapejome.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/wasurilelatuvavev.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f82da5d37---nufudosetej.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1e2b7a7f---76116463882.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/rogigifosijav.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/firasanufumaluwolewiju.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/18628280174.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/22305058017.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/97821158289.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/majarubodagesoravebed.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/21788227249.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sexilibitudiropizovusu.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/55355095393.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988cb48a4b2---duletotowojilopufe.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210617184906.pdfIn PDF document text
    • http://ausafe.net/images/art/files/13710813188.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 11036 bytes
SHA-256: eab62982455fb72be8317ef84213f0dfe41d948c2bd4c4be2eeaf22967f6cdc2
font_01_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 19332 bytes
SHA-256: 27fad53a6ecdc323f8dae5b0dce0f7ea2e2c5db5ced446eceeb50043a2819822

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