Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ede401b68193888…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 22:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb4eb9f8b2b222baf6b67f055d192115 SHA-1: df6d1bb7e2a2b84c3bbeba465922a91250fa318f SHA-256: 3ede401b68193888f2f00d66d521a9b334c2c2d13254c337fbabe42789e54bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dehayemek.net/upload/ckfinder/files/nopumegulowu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608520abf1087---87110182545.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab7f70417---sutelawaba.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/85fd2829b8e32fe54120a4adb562a42a/90146484481.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/jaxatif.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/51bdaa54be114248640709e5aea417eb/koremeja.pdf
    • https://panama4d.com/contents//files/rizisapigefodizebe.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/38o7nqi00gba5p23nmt5e8e4r2/10145604063.pdf
    • https://cengilli.com/icerik_images/file/6044460507.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3akb4drfq3vg1j1e333q12e0f0/25074351017.pdf
    • https://sjalikave.hu/pictures/file/85010001641.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c892b3ba---kawofawizedovutiluwafi.pdf
    • https://aslimitada.com/userfiles/file/1518938516.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d0cb8ddf---23315569035.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f3a6rbsbrpgfsk50ornlusm9g3/zexiwenerurezonitijom.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5pj3h5j6n9kmtuc6j8k8k3fn84/61665200792.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8e964208---vakuvekupugi.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f645085a34---80303038048.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7997dd1196---siguxoxuregopusavene.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6742264f---68750247347.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cd50ae81---pitudigaxogiladusike.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec6de855---tobasidubufane.pdf
    • https://beaszemin.com/files/gizesaxoxolu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=entanglement+of+formation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16792 bytes
font_01_sfnt_off0001078a.bin
6066532558deba14ed4da269f24de18164ee39b80838b53d557c617fd4ccfa4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 19696 bytes
font_02_sfnt_off00013c12.bin
e45ac412d18104a70437937293d28027435b0432c74093ffe3369ac1c09f3cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 10372 bytes