Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a43501b104ec482…

MALICIOUS

PDF

90.0 KB Created: 2021-08-16 20:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8cded984e4aa693867e4191a36a0861 SHA-1: 5467f5d2024c0f1e448e635352bcf75d9e794dd6 SHA-256: 0a43501b104ec482adde38de14492b2f0ebe02becdd97089bd3e81dfcd8c2d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of malicious intent, likely to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=you+can+be+a+stock+market+genius+espa%C3%B1ol+pdf+gratis PDF link annotation
    • http://eltdb.com/UserFiles/files/wifekibigulirewujamoririf.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f656d645e2b962b947528e4bdbfa05e8/33575895774.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/3626283792.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/51599120512.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pjt7qqncvi6at1jrbckc2eo8eb/xosixetanusigukisova.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cc167510ba3---wogedirutenumofaneluvuxid.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe37a1d6d---xapojajipejutepamul.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabomobok.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/vajerumabavadanusoxe.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/migiborurafoposivi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/galot.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8b6df6878cdbf64ac4850abf3f9a8435/wugelovozix.pdfIn PDF document text
    • https://5uempat.com/contents//files/kuxajekalusipubawu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/vuwojumugetigej.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210625_37E046180677C296.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/31855152940.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/92607994670.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/92332376354.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/zajarulez.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/26850483960.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/366b1412c201c5c8312e7d7a6808b511/54939743978.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/30a98ae8eee45baeb99f1d8581068ded/gawufezetadonabufotubojal.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01af28ce3---77522492404.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/g7ebt5ice8vonmrlpueu4gf242/72166320569.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/jujivetujaxawopiwotam.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11484 bytes
SHA-256: f413af8bd1e4fc3e764f35c50abf6c45f194f42f8a2eea0ec6c43438566997ca
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 17120 bytes
SHA-256: 824d6a101164285b8d16013dd1c4b642e7390ee4fe1e8f4227146720ec7b5a9a
font_02_sfnt_off00013e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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