Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbca958a52b3796…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 17:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc17857d46dd5ef19a86361924469a48 SHA-1: 0063875f3746332c728260356dbe85c69ac47d40 SHA-256: 7bbca958a52b37964c36311ea4ea734abe7386a0eb4d65d29f76e1487864a46a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The embedded URLs and the heuristic findings point towards an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=mp4+mobile+movie+bollywood+download PDF link annotation
    • http://around-sicily.net/userfiles/file/jedadewo.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/71215513022.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ac19e5b4dad1c9bc2ac448e4f4a22778/49814323235.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc529e8bd---1425370268.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab7d32b33---21449027578.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/jadumerelumo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9b1abe9---55597980266.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2888c5463---zuredosurajifavas.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/nobupanikijiteripopipel.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/1276593893.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e385aeb00e6a658b599e457a451b0240/37805448603.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba293a2f3---9056148939.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/fubopofik.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9cc99d6a---60046851745.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131727cb31ee---laleta.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/98511220768.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/muxesababup.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/wenuxuvo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161388df53bc85---dipasubidiletizaturilosel.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zogodidubixo.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/zumixenokebogifafozag.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30497b603904b24fc85f1af1943ce01a/75860757512.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/gixivewujozigizi.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/58700863207.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/70722952182.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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 10664 bytes
SHA-256: 5b4ac4031feaff44b4dd8268e1be761a68be2f31fb0e5ed085791b50991284c3
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 17228 bytes
SHA-256: 1a3f3692f80ac1db43a603c76cd4137927f84ba7a03ddb592a2d2b70b335376e
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1