Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6cd906df833b4f…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 15:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7193f171b2cfa75b2d46ba8d5e8c8635 SHA-1: 199add5011a0b0d07bfbb6861117b63ce0138d03 SHA-256: ca6cd906df833b4f1fc010ddb38c1e11faafcdd9679c3a9254fa89bf0079fe86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://sghscsjamarai.org/guruhargobind/userfiles/file/gezodagisul.pdf
    • http://ahxxzx.com/userfiles/202104/file/tikekamo.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4fead2ad---somut.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c281e4e6---70582710993.pdf
    • http://ferrogep99.hu/static/media/file/98709660610.pdf
    • http://parvazyab.net/basefile/api203/files/38415477027.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d500951f4---66679707088.pdf
    • https://megalightgroup.lv/uploads/files/93536665621.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sr76q9ldqmaru9mjldut6i6oj3/ditifizukedepapa.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/24766616531.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2n234o0konnrbiet596aq3vj31/jusaxipexepigogotuk.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91936ae7fc---nazovol.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/741b51c75746642cd5f007df0fd54e07/bidopanerigeb.pdf
    • http://ngocvietbungalow.com/upload/files/dukinafitagodiga.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5af1c9ec---xivufusinedorolalitokare.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/35351032387.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/24e7a2c998130a18417437bde85bbae7/mezanavagivaxomataxude.pdf
    • https://dock-levellers.com/upload/files/xaxejefelonazabewu.pdf
    • https://blogsma.com/files/16947150958.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/okljbtjdqlasv9c2eota35fj6u/44494559266.pdf
    • http://casier-a-bouteilles.fr/file/zolorogu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/afthqavu90psor2ec8fd1obdsd/29980356392.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/532aa74797948a5d3f106fcfe340d952/34568465043.pdf
    • https://foundryindia.org/userfiles/file/lameratubepuvoxaf.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ade9af0d74d---fesenedulifisaje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+tempest+pirate+action+rpg
    • 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_off0000ea26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16792 bytes
font_01_sfnt_off0001023d.bin
df7589f496b4b9892c9ccac5906bcae9079b705dfdc6444a8d00c71a05deb63f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10944 bytes
font_02_sfnt_off00011b6a.bin
1a32e19a164230f5202e7228c4067d09a51db114cb48893be806349fe80ac824
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 17416 bytes