Malicious PDF — malware analysis report

Static analysis result for SHA-256 94049c1ce32db5a0…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 23:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 456bb93d62629e7b4d1eb49e72c48645 SHA-1: c0661eab4e283dac1d3cf34ce010de70b418e59c SHA-256: 94049c1ce32db5a0d7c5ae3695269ae96afcd1967eec4e386e998a0447269fa8
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the linked PDFs. The document body is unreadable, but the heuristic firings clearly indicate the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lucidareemantenerepavimentifaidate.it/userfiles/files/28200373579.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/nonabunabiful.pdf
    • http://jinanxintiandi.com/userfiles/files/wezifezawo.pdf
    • http://abwpetersburg.com/uploads/files/57634245780.pdf
    • http://gostinica-domodedovo.ru/files/zelete.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/08cf3b56b78fabd2080fa7556121c49c/wavusekivovububuzeririxu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfc53cb91---857526292.pdf
    • https://bodegoncriollo.com/userfiles/file/kelajumeworu.pdf
    • https://carrieres-pierre.com/userfiles/file/gizipemusubediseme.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e46df9a4---tovujipinegivimokufef.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ee2c82d9---mosovuzorasij.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b1759de8ca284c95edbcaaaa79fae452/17744701325.pdf
    • https://ascinfratech.com/clientprojects/trading/file/degagu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd1e34e86---kupikekiwexigotifu.pdf
    • https://brod-plovdiv.com/images/muvakumofaxibiwukogu.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2ov51r98ogth4mougqt423vph1/nokibuvakekozufezuvolaz.pdf
    • http://chonburi33.com/userfiles/file/vifex.pdf
    • http://fixafilm.se/userfiles/file/gavesajomaxemimujel.pdf
    • http://chikatere.com/Upload/files/52176727877.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90e20a677---zekerekidurimimuze.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kar0h6knbj2vocc8mr6dfe8b1q/57747019968.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160892ce03b2d7---56098214101.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/46b38c97fac297d45137619061871dbf/25470697091.pdf
    • https://contact-house.com/fckeditor/upload/file/puwosoduvalotilikawufeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=seven+letter+word+starting+with+g
    • 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_off0000eee8.bin
2e68103c491705f5c1f1cd63bd8340a29c2ded562c0ca2371863b884ec2c77ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10752 bytes
font_01_sfnt_off0001076b.bin
2c48af9393d62ef3bfeb7f5eacab1a60d6fca6049b5cf372a09cbcf4ad8601bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 18140 bytes
font_02_sfnt_off000136bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 16792 bytes