Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd96b5172dce99b…

MALICIOUS

PDF

90.1 KB Created: 2021-07-16 05:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21df6d53c804b2b6e1bcd4b6b1144490 SHA-1: 323f50145e327e687a315fb9bdb61272388c6e73 SHA-256: 1dd96b5172dce99b9e72626ac841dd3b17e083b0b817b91fcc5d1f9ecc5a6220
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to external URLs hosted on compromised WordPress sites or disposable hosting, likely to download further payloads. The presence of 'SE_INVOICE_LURE' suggests a social engineering tactic to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://allytemp.ru/uplcv?utm_term=size+of+envelope+for+first+class+stamp PDF link annotation
    • http://www.abcklima.hu//data/editorfile/dumekod.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/757d5edd33dc1ce536c9555e47fcc917/zusisodavaratepi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a670367d875---96833242585.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683594fe44---30256818690.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fd61c4a5817cb57d5d9d6dba61a68c57/resodakovikizoto.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/6938567498.pdfPDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a126dd0dadf---mezuzususifiluko.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/debapebiluxubabovesosido.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ac11dcb5---walap.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/739f07785234f414dc50804b4ad2773a/70584581455.pdfIn PDF document text
    • https://33mobility.net/uploads/files/43793233275.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4e0315415b8486423426c0bf7fc67929/kidivogo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ee3dbe8f---17422848638.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7604df60e2302d0689c112fec62606f9/wowaraguv.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ba618553f344bfd569f9db84831ae113/notaxilozu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba814d9c9---98566148398.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/nimowejatovirusiv.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/napaxonibisusurotufolesev.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/68970557962.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/sejigugage.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e01bec85---352461161.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc0a93d76---jemadetoru.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bb285b11---zakuketameje.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/npt983ljhr2ocqqd3odjtj1q86/bumupevelesigodejasepafo.pdfIn 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_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 17004 bytes
SHA-256: c78a5bc24f3a590ec3a901d707a024db1ac9597e656ce9e98b049a7c85d5df34
font_01_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477A 10844 bytes
SHA-256: 15024f26898db6254e3be8ba07fb9202b2149ae6971fe9c2af766169babf5a8b

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