Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a073bf54f93ba38…

MALICIOUS

PDF

92.8 KB Created: 2021-08-15 09:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09a606c08ed6b6de7ae23f34973a7966 SHA-1: 274dbe35fd5df937c43f949816ab2e7c9dec7911 SHA-256: 7a073bf54f93ba38177d9952e026c5ce41505a9854d308981d26110f32ece2a4
176 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, some of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs point towards an attempt to exploit vulnerabilities or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://plnjl.com/userfiles/files/5086316768.pdf In PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/52118417359.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/40121802959.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd31ae247---xunekiputegilufuvipomet.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f29117f76b916153ff229ff37bb81867/tojutusivejelirewipami.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/kewapizuxigod.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/61824692463.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4e8116e6---fubaberobatokobene.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3861651d6cd88319ccfaa84d5fbed606/6004710171.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05666ae441---zijaduzexusa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609faca434cf2---rivunuduteratumewejukiki.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/kimupozesosavepolefarix.pdfIn PDF document text
    • https://banghenails.com/upload/file/wuzawiwaxajuvifepoxiveki.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623135225.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/wujumalenu.pdfPDF link annotation
    • http://generaltubi.com/container/ckfiles/files/64688844664.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a820ca0b521---83608202063.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a39016cf03db517f6af7a5b2075be375/32193664846.pdfIn PDF document text
    • http://evola.it/userfiles/files/90079792489.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a44c807b16---jevuvatopovezodi.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/75028233738.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082b62198883---14686276313.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/wunomajujif.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfde12c190---95112381531.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/bijebitikugunebojun.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/20508575228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=super+smash+flash+2+weebly+66PDF 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_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 11012 bytes
SHA-256: b20ca236abfea0cdb3dd9776b158279c6055db0829d6f9b8804e2a28678a7deb
font_01_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 18440 bytes
SHA-256: 1be6a3810f0f20a58f8fd626b1554c51c87a45e8ac53d3c37185080848bda64a
font_02_sfnt_off00014c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1