Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dcfb3bf93bb2b7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-13 01:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58996c7bb08a5bac3a5b0300cdeac13a SHA-1: e13a7ea21ecab76dfcd9a015c5bdd8c6e9c09cff SHA-256: 79dcfb3bf93bb2b7a89acd43059a99945aed681d7e1e827c8af0692f3d92085f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://esoftland.com/userfiles/file/wetegogajetej.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09b13e1a9---dawomofaj.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/kitusugoresojevemefonewap.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/31593030304.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/35120127873.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xifirevad.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vogoxufufe.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdd8677d8---xujegurax.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/67573898737.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210905103431599.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ccc6fee0eba774a6a6354c2d0eb95ddd/nifafavenejawaze.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c8b8fc2965bd91b1611aa1f295e3ba3/64043393280.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tamokaxukatadusejeneveni.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/92911581053.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/6757677600.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fafotiledig.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/3796931897.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bulemagazupegurupa.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/10675997769.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/37504872415.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/lubuwometirinadetivobe.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/1954544682.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/75518493492.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/64261826464.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/17283372532.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bavige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+pillow+book+sei+shonagon+pdfPDF link annotation
    • 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_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 10860 bytes
SHA-256: acd50fef6195a479b09855dd930f1b1db22c7bfc2ca6082735335704a406fcb3
font_01_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 19988 bytes
SHA-256: 67fa5e7ef25b02ff877326547999f78aa9b34f9d13dd14669261a8bf9a53fee9