Malicious PDF — malware analysis report

Static analysis result for SHA-256 644f1df95c588579…

MALICIOUS

PDF

80.1 KB Created: 2021-08-10 15:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d829848c1d8ede00f2f31c875d12a63 SHA-1: 463662795c88055718875a3d935ec9101e2f9c78 SHA-256: 644f1df95c588579529439534b3fc9390dd806d6a107877fe2561876743d3b1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs, many of which point to compromised WordPress installations or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=cambridge+checkpoint+mathematics+coursebook+7+pdf+free PDF link annotation
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835623d5f3d---56159325633.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/kibodiravevekidazepolama.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc725d544---temipidemag.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089befe88356---ronagibimako.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/209223ccec41326922b39ea00a459835/33361998263.pdfIn PDF document text
    • https://olterus.com/contents//files/25391166018.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/88777336893.pdfIn PDF document text
    • http://school15-tyumen.ru/f/jamapisukuwosudasajoxikul.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/fokagibajulapamesis.pdfIn PDF document text
    • https://qnzar.com/files/87351441595.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/kagotuko.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093430c0cb6e---potikul.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc75b6d0e20---lunonajogek.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pixaboduzinafap.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/015dc79084605343647e48d69587d1d5/kafezipevilazub.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/galipijivi.pdfIn PDF document text
    • https://arerp.kr/data/file///jevul.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc16e72478e---pusevugopi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/51610524267.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/83105945c7541effd2d513fb58241ddb/64683366042.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4bec044b4f466efa327528b8775282a/2421340184.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/sumazupoli.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mirifux.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/zibadufitopejawidudoki.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 11436 bytes
SHA-256: b37b72a9c1166ab58a271f1a64bc4ec48f9ce7ec80c95ed5832b5c003fda1971
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 17052 bytes
SHA-256: 28337d88075dcce4a067e9e58c89423ebabc192f5a68b9432fc80ad191c35bad
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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