Malicious PDF — malware analysis report

Static analysis result for SHA-256 812d361dbd952738…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 12:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd4b67dda328dad01dca17f1d4ec90d4 SHA-1: 00e71625af7a327f20fabd5a322ac6bdec1ba8ed SHA-256: 812d361dbd952738de8e5070b23937af0cb01c68d7697ef6cbe5d7321aab25c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=mathematics+book+3+pdf+download PDF link annotation
    • http://jarosi.hu/files/file/fuvivavexusafijoti.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/64579999211.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gigijunezonag.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/pujusanozatadugarivumidux.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/68113671593.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/makoxuxerigobofukotakijak.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109070624208757.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mh3uuf54d6qd7mrga7gbvi5t5o/58234104605.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://tecnicadovolante.com/images/file/fifuteb.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1f30b071b05cf3c395c48551fa7e9e3c/botebijibujefumasowi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/nozikirepirijomejoge.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/direwopujawasagu.pdfIn PDF document text
    • http://prokoncept.hu/admin/blogfck/image/file/92799589083.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/murufefif.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139223020aae---gutakolil.pdfIn PDF document text
    • http://zeci.nl/im/image/rudututuwafiba.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/xopinevapipoforivow.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/99836734854.pdfIn PDF document text
    • http://castel.lu/userfiles/files/33661631962.pdfIn PDF document text
    • http://taxfreepoint.com/file/domuvamoguteb.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/77301957307.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/14551301837.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/49104213997.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/karuxipoxiv.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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 18932 bytes
SHA-256: 98ff68a73aa1ca23c068c057cf10946377a00d2005eb5d0961bc41a30e07810d
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 11268 bytes
SHA-256: dd3a6e94541c9f3b7b4d3537d936cc397ffd6783e88e092ab5e540d476e4ebd0

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