Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99709643512f9ad…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 03:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c40b5f503943943741ad89289eaddc7a SHA-1: b4bd1e22ee41cb0a23a16ccc8cc99db90d95b5b1 SHA-256: c99709643512f9add2949a6b3ad06bea3655faf51cffd67b22778d56d74ac2fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd56b346d---433788512.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609295c930cbf---56440757174.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa78189b9---1482460271.pdf
    • https://aulacvn.com/upload/fck/file/munepusegowevazud.pdf
    • https://stiff.pl/ckfinder/userfiles/files/saxodupanoli.pdf
    • http://zhengfutz.com/v15/Upload/file/20215172221216542.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dhri4hukt2ajbpm0vlrbmaij48/sanasawutuzaz.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nedematumikatig.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/csme9hv0lefnfvrv7jj25kq5ns/3064842255.pdf
    • http://thedewakohchang.com/image/upload/File/4578618930.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/gilobitamivukulesix.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3896d5d10a---barizupuxarobusodimovora.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a55319f6---20070835695.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/85724436420.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079437226605---kapogazurinopi.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff0ebe5bd---42809384613.pdf
    • https://clearpatth.com/userfiles/file/zopisubebatafujove.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3e50d5e5f41aea27c38fc164271de867/miraninuwawavefutiwi.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c81bfc25---51269297269.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0dfa1136---15575254381.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9d03bdd94---mobara.pdf
    • http://ubest.ru/images/file/zeraxilojogijazemibezese.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/65271176959.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/gesabeloviv.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/97072ae4be90fd45d95b67a1b6070281/jajezopid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=substitution+in+equations
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fd.bin
50eb17cc4a15e41064e8b98624d938c555e2aede71696922ae81610e781a4782
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10416 bytes
font_01_sfnt_off0000fab9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16792 bytes
font_02_sfnt_off000112cb.bin
6aa408891c09c81577ead80bc36da7cf7d6aa6997ce9d362f52558d001aa1287
pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 16592 bytes