Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85268172d6413fb…

MALICIOUS

PDF

106.4 KB Created: 2021-07-06 13:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d9bd870bb1f62c16d2c97fe1c6b1200 SHA-1: 6574f0dc669e02ed7b770cb9effe4e33fe8e0ecc SHA-256: c85268172d6413fbd53ff2e0e5e03ca8b12d6d21e54e238980347562e396c36f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://infrive.ru/uplcv?utm_term=grace+of+god+meaning+in+tamil PDF link annotation
    • https://almuhja.net/ckfinder/userfiles/files/fijijo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/16dbc2bad02fe2c3e4c26356a787b416/tapuraxefi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m6brv9kb7hg52ccuav8s1r4ke2/lamavivimugixupave.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/finamopafoweb.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cs65c04ifa91phk2ovcsn84132/jabuwuvefe.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/wanujesofugeb.pdfIn PDF document text
    • http://sivam.pl/files/file/53908273824.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d140b6eb---52454846975.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160df525a12ec9---45059275928.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107061200043911.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e405a405059---bugudafazelatexepas.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/73665172748.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c90ca0fe---56427463121.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96b801d71---sedobosovigawu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6f98040c3f9615f59c6fcabf8af5f92d/tetuvalipon.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/88972d45c8285b3599240a02e267ec00/49690546517.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090707e91bd7---89920512437.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/getinifebuniwagenajoroni.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6ejq67qf7fa12o6vspn2d7649s/kopilez.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bfeed53f3---59366721055.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/vifolafomusalorujiz.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cui4qqriml780o5iuo2lea477r/jikarefaxidokase.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/84042091730.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ef0aaac65bee2edaa646f81a82950e44/jagojutal.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c457a24e6be---mejujenadod.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c177f742b32---80654550468.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_off00013e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 16920 bytes
SHA-256: ca8f6608871d40df0ce02a3fae020a202a1f76e0858fd6f3fa7ae5239a5fc76f
font_02_sfnt_off00018251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18251 10692 bytes
SHA-256: fd2aedb57b46ddc555ac423e592fd4b8548e622a5ac22a9636ca4cd1e64cf6ff