Malicious PDF — malware analysis report

Static analysis result for SHA-256 608c2b46ce76f494…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 22:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab0460158537ce519e046c5d9ee9108e SHA-1: 699bdca08326dcba7c5c3df865a5dfb36777083f SHA-256: 608c2b46ce76f4943d23bf914c581e8700e55824226402589a32d152b9f9a228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://chcial.ru/uplcv?utm_term=clojure+tutorial+pdf PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fh7ob06rnsads94djvej7g2lqo/kirosijakatexunemu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9e5ab1c1---biworapafekazeloza.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pbrt1qs5im2rsal9b4m1vimdvv/ritaxutakewagisum.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a483eb481b8---89519532636.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/716c198970c3eaeb3746eafd3be17595/sarevubijapija.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/bebisa.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/pafazivatutenavitewaxapo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0422c629a---69784686057.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/10449904685.pdfIn PDF document text
    • http://tulga.ru/editor/files/79667089270.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p8k82um6i42gsqea0p3ppfijc6/rosogogamaka.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4726ed565701d43e306441d02f4c3c3d/rinonosetajavo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e33991a---raworirerokaduvur.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ttcnv2eris4m1tuspq8bf3ak4e/xiwujixofajugatinadabemez.pdfIn PDF document text
    • http://axwelindia.com/uploads/biwiromixojowibawawole.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gbocfd2qf3or78aelokm4386rn/podukakibizoguxu.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/54012818454.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/derefaziriditufet.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/84802849313.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/49638444579.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851edd548d2---biladukaninuzaxeg.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/45214042831.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/furokakolomuwel.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d022f485---kozugaririfoxub.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/6537487508.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1de5f17488d8811f35ee0c517ee23405/zaraviruwimudigofajig.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_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 18844 bytes
SHA-256: 55d8a114e8601b357acd32bf5c8c9cc6c4685437bf2e8f8cdff04b8596fbd092
font_01_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 10480 bytes
SHA-256: 7022472f1be79a8cfd308b629aac06dc0fbc300315a766b2a76157df599dc34b
font_02_sfnt_off00014f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1