Malicious PDF — malware analysis report

Static analysis result for SHA-256 881c307536f63f13…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 21:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ca718d6500e75f9aefeb769b1f5e2ac SHA-1: ebab4b3d6c95ee8d2c03cf910fb32aa2aaa88b3b SHA-256: 881c307536f63f1383d7b9a53a634faff580a530cb0d7b364e628658afd71d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm hosted on compromised WordPress sites. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d0a349d462b1c45487540c2b656c4310/pixax.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a311ec42533736e5c27f17a8b0894287/77266338274.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rkvj97kqlskohnmr1p93t5nm7l/pelakaligezijimat.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e2bcb1626155c6a92093eb9ac82ff5a0/mujenatifewaleki.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hhpt3bu0n4780to8c91hf3snv0/90067925463.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/59755823764.pdfIn PDF document text
    • https://goodline.by/userfiles/file/vedepode.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7f45794b---16000347038.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa7ed1f84---danamepopogowemixufel.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d82e219e1dfefada1120d1cd94d86693/xoxiwabififanofobajebulep.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c66bdd24c918b3cfbc3b41a1a1a2c7e6/23722893726.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986bdee095f---legafinebanek.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/48749914089.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/nqoon8keimbp6n8ofuc7mcc654/simijegababerenerotuzenop.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9d6f3da3526b022c28a139ecebc1e58b/16485483903.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b7e23b2341734e94a5e6924eeb0388fa/40595117442.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mutivabemepajobugeza.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983bc809a0d---47155468156.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a8df8a140---87438496120.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/funagilobuxafirarasaxutug.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/tilaromaxakulofumon.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///musit.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jlvi5ogsdtfj39qvojc3d6hhf2/pazide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=1+mb+to+kbpsPDF 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

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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 17828 bytes
SHA-256: 980991c20c50811f829251ef2e81aa4b783c560f4255b000f2573cdcda83023d
font_01_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 9964 bytes
SHA-256: ce494437a8af639fc769d880ec10b18fdd0579308f0f5f0b60bd3166def0d1d8

Open this report in the interactive analyzer, or submit your own file for analysis.