Malicious PDF — malware analysis report

Static analysis result for SHA-256 e701af38b494a4c9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 06:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dff267b580db9c746b40e62b10cdbab1 SHA-1: c08b49bc98bea955a2bacca0fcae388d32f7caa0 SHA-256: e701af38b494a4c9291492050698893cd712d5b168d5389f4ea2d411119ee2d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with numerous external URIs. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=can+closing+cost+be+rolled+into+loan PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9c9354832e0055258016d74d027ff3b3/28311635298.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e84dd640---68203327828.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/risekovegoponepe.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/najetof.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///60841101394.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/jasabibukurikimozenur.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/98823958846.pdfIn PDF document text
    • https://kham.vn/userfiles/file/vexajagajuwodasitosoru.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8ebcc2c324398f81d7b8229f0b814940/durexivukepaderok.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/xelixumi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f5621eb6822468638453b165372d7701/najipatojumulobosezoba.pdfIn PDF document text
    • https://dm288.com/slicice/file/21155531563.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/84244128235.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/pezesatulabowigelomok.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d09c9e0af3---judotefivotapukodeb.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/95509850847.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6be4275a---gugiwiwonodax.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c327f3709d79db95ab0cc624a0137930/56053780120.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tepawukexoxirapuwes.pdfIn PDF document text
    • http://kite-surf.sk/files/6349092099.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/95921276298.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/situdugutufabijebix.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/kigelatex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4f9f01ab0---37028912267.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c1166430bca5a55cdb6f28f567e5eb1d/38096150937.pdfIn PDF document text
    • 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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 10716 bytes
SHA-256: 9699e203fc465a030416322c3a92e3b1cb1ea3cf514bc600c98ad4574ca0ab78
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 17496 bytes
SHA-256: 2c04eeaa1a24de35bdb2f0a0993f52cda6eb830c0a91fa99495429719a2722f9
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1