Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bdf9dabbd045a7…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 00:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd9920aa638be21eeeefd7ee914ce9c7 SHA-1: adb9b8c503836177d6e6bb2035bdced5795be480 SHA-256: d7bdf9dabbd045a7e9c6a52126618a72046d0b0c3b069f9be40957dd291153b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a click-outward action and the document's small size further support the lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=i+forgot+my+gmail+password+on+my+android+phone PDF link annotation
    • http://nofatrans-int.com/userfiles/file/55175166250.pdfIn PDF document text
    • https://nesselaarbestratingen.nl/plaatjes/file/ferukamukufuzogorexameped.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/rodinomawaminevuwokugefez.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/duxiselofitogovokazedesi.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/41259255135.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ogude8rcgais2pp6b6urdea9l0/vusinapoxububivi.pdfIn PDF document text
    • https://perbloland.com/userfiles/file/91946550478.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/53451722095.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/mofonu.pdfIn PDF document text
    • http://video-cycling.de/files/file/31850157412.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6a28bfd---wovikijotijapizuxawekazep.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zavakoxenuneloxo.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/jokuxixagaviz.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/tuvibevijikupimerozigowit.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/kinokilukaxisufoxovu.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/85297048611.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ha79teont10mbj7mbsabrb33sr/12148348571.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/jaratologadolav.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/napomobunaw.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/wujimemekozifuz.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_off0000adbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 14260 bytes
SHA-256: b307639cc4a1e04f26d429bf6a5780126a2e8d1343e5a9d8d11d586e727ae014
font_02_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 11096 bytes
SHA-256: df70b2d31d1b1ff11910b0dc24f133cab5d8715a078e3f0bbd80a3a9acd7bf91