Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a03a27cf1b4796…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 15:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9d520991fe1487d5d42b610b4c28233 SHA-1: 54804048fe9804212cafa4470f93876b5a875fef SHA-256: d1a03a27cf1b479633ba3a53a85cad3a034c1d5471c8bea903c3641028f7ecec
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including a small file size and an image-based appearance suggesting a hidden clickable element. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 75 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 http://archissimo.eu/userfiles/files/furefokalajowazufizoxego.pdf In PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/70646051859.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pojemimetov.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c99976f1---92308995354.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6df0c6e129---10598828741.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/81337513987.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca1639859---77420665696.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/27603158101.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/zomaxawitej.pdfIn PDF document text
    • https://btegypt.com/file/gipovugerebemi.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/78231181859.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161186dd82681a---3100443200.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210802084805422180e9pkcyg5w9ro.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/53319063800.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104997e2c3d2---bowibekerifakevuguzupe.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/24259278069.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/didukesiwupezisavabixawi.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/88774417616.pdfIn PDF document text
    • https://esz.jp/img/editor/files/numopikaparopazakonokeba.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88b582f5c---86297875778.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c695ab4bda3---47178897026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fundamentals+of+electric+circuits+solutions+5th+edition+pdfPDF 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_off0000c954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC954 14336 bytes
SHA-256: f40f7f9cdb767250933a0384188c917f3503574f410bd153570fd15a9b682d2c
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 11096 bytes
SHA-256: 436e06d1127ba930a3fba65ef8d72dcd2ec03f5f623fdf79c8499e0691a33161
font_02_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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