Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0a26e56426e767…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 22:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a531e6011437284de391720a5f05c4e SHA-1: 39a221b80bbc6a4b8745453419d3a1ec2f70d209 SHA-256: 8e0a26e56426e76717ee224c352987441faf15c9fd32e33ddc122475d1ca0bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised CMS upload storage and disposable hosting. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=reenter+to+confirm PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d5d5bf97f777e1f04862b8815fe8236f/40103804828.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pebavob.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zufamune.pdfIn PDF document text
    • http://mebco.ru/images/file/wonibebozovuvazarivipu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/sabamadoludibimeto.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/45848799204.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/xelozerifegu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/tususezitire.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/38mbbi9ha1rt61t1l117i7bv22/10108808672.pdfIn PDF document text
    • http://learningkey.org/userfiles/pukuwevutujulagobul.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba366a1d06---60012254363.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/rujolisatozeler.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084157fb8349---wunolawigipodopelisonotu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c275394c489---ribojoxiwipapa.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f23e449914afa42fc8b9fc1f1f0e1f64/45211336571.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b357c1b698---19226843355.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/qns8pen3lkgshd38q937oup037/12029391342.pdfIn PDF document text
    • https://strechybenesov.cz/content/34703130660.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/mopujobix.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b842fad412---zajobusodijenokezutazad.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea060a821---21010828918.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/jaxaku.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081735f22603---82215931732.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/596586709.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_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 17696 bytes
SHA-256: 303b8cbf9e6785849e803095c1c5d6f75c38e307bd6e801d67d16e81d6cf0a37
font_02_sfnt_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 10168 bytes
SHA-256: 130c00ed840085e1733763b89de2f5bbbe695c59f7282b70a0d2925d08a8b992

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