Malicious PDF — malware analysis report

Static analysis result for SHA-256 389a1a925547e68f…

MALICIOUS

PDF

95.3 KB Created: 2021-07-03 15:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 095b84ce59970982b34abcaf58712b33 SHA-1: dec4a61bcb06d38cf1f3958ddc926cc6cb826559 SHA-256: 389a1a925547e68f3b6cd0f9c0caa84df598edfd4c11686cf69c4fd23bdc80cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://associazionedynamica.it/uploads/file/30553709054.pdf In PDF document text
    • http://ascensionchina.com/userfiles/file/37392175796.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4974c4f26a---juwasufowiv.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bf28d3a7fd664dfb74530f3c0e56bcd6/pekadimafitubulit.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210610014501_4nbxij.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/da093903f3f234220a0a77e1812dc92c/getunujamimilagidu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/65afa235c6e54aa08d5e0d552d32e39d/telotibuwog.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1p1e4phku6psp0mq0vcn36ohq5/xofowiwotafilabodazirobat.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/45615690751.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/roduxutavorefuxak.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0f420538e0edf48f545c7bf928ebc02b/tekovuxafigudawuv.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a514c665673---vajiwurapizawivoku.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098621539e32---71875530079.pdfIn PDF document text
    • http://canadanur.com/resimler/files/42823544865.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dde9e210---wapazabaniwilowev.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vjuf50d51mm9osc4240ssu14ul/guzajazabobux.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/83fff08cfb8ff9ee01ce88ec5eea74df/75169120794.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/65181762237.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/22343607645.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6ef6064a7c4275e9d63a974faf6e5cfb/87297183784.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3ce343e3---jafivujutazivitipipukizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=electrochemical+corrosion+is+also+called+asPDF 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_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 10620 bytes
SHA-256: 6f1c397af5c2a2d7e93c600f1eee1fa550c31013fe380cd0ee8dd8c71094f6d5
font_02_sfnt_off0001403c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403C 18288 bytes
SHA-256: cbbb6c1543b1d4100ae715756f5fb20a007305e618473f10dc42bbc14a4810f2

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