Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a953382b1a62de…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 08:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c405bda5c1dfc2e75e1f3ae1bcbbf54c SHA-1: 2172fafce7d902e9913a88b7ecbc6066254605cb SHA-256: 27a953382b1a62de3b0a913ee53e03d14da52252b86afab248dc11dde0a3e51c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The document body is heavily obfuscated, but the presence of external URIs and compromised CMS links strongly suggests a malicious redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=free+open+world+games+ios PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161412b3e41195---69734235782.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/28179358238.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/73230071663.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/53844794578.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/55912162183.pdfIn PDF document text
    • http://sbcnepal.com/images/file/69715239011.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/26994285552.pdfIn PDF document text
    • https://pokereshop.cz/data/file/51500995204.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138551143cf9---nonovuxodu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/12742616777.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/26428437040.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/26198839755.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/54331058519.pdfIn PDF document text
    • http://seamacros.com/upload/file/25502826859.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/dojolatipiluw.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/34944034547.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/92205696468.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210912_04E8782695A8363A.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/gubonorogisibevewigigawa.pdfIn PDF document text
    • https://zzwgjx.com/d/files/kufujedet.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4e5ecdfa---zetoru.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/7833792608.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_off0000b62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62A 10700 bytes
SHA-256: cb4311d6d39481e081ed6f989967391e0c77f77ead306287ffe612c58f332196
font_01_sfnt_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 16672 bytes
SHA-256: 8131975685f756e515c00ac71a2bc06c6841231263fb568471862ab142b21c18
font_02_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1