Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6d8947dc9663b6…

MALICIOUS

PDF

99.6 KB Created: 2021-07-02 11:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8ac93dfaee381f6b69149e848d9cf4e SHA-1: 297bb1aa527d98d1a28af12ee887a39142ed1a82 SHA-256: fb6d8947dc9663b63ed6992570cf46afdee81ec98d078c89e957cb05d743e559
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, classifying it as a phishing trojan. The presence of embedded URLs and the heuristic firings strongly suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9758

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nhh49v0akmj1g8kg51e812uh7f/fexagametosemeza.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/53059108435.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8c4bd9o53qun9cllnuptip7m85/fukozekudusavaxake.pdf
    • https://acryl-bg.com/userfiles/file/lexoxurupobu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2952bca7f1---vafenadugiv.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/80fbe84a967f851c33879110baecf777/xuwapapimurikon.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16199757899824.pdf
    • https://hansenlight.com/UploadFile/files/peregarolur.pdf
    • https://sanmuabancongty.vn/images/content/files/kogepojijexevoworitu.pdf
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/libufojerabej.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cbf138ce---jegutobevewuxotagelo.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3acb301bf4112ea1c721394da167515d/wawiduveniwegopixalijab.pdf
    • http://asztalosweb.hu/userfiles/file/70489867794.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b0f092fc09f70872f5b47ddb9c070295/28434265534.pdf
    • http://industrialdevices.in/uploads/bobuwenepijadikili.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ac1b991f---95738803750.pdf
    • https://propiedades.net/ckfinder/userfiles/files/81598039832.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbfa7d73d---5980927844.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16c416226---842833113.pdf
    • http://officinedesign.it/userfiles/files/88915692525.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e7e10458---44644870956.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212eeb57e8---88357460290.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/u9stncdhs83puh0q1jnvs68j7o/27651024739.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ef494122c9cd4e3c8772ef6c2a0abf6d/kexexujere.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210614005057.pdf
    • http://writtenmail.com/upload_images/file/95909722399.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+add+a+line+in+word
    • 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_off00012558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
font_01_sfnt_off00013d6f.bin
d01c34a93b947dab0d06ae591f9da2b542e8fa5608a4871131a96325db04ae68
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 10148 bytes
font_02_sfnt_off0001542e.bin
1f0ec44fe312c2b25c9c9f6de9881d7936fdc056124616349ebf6fb3a235f371
pdf-font-stream PDF embedded font (sfnt) at offset 0x1542E 17188 bytes