Malicious PDF — malware analysis report

Static analysis result for SHA-256 a179b7d3aa43fc70…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 03:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f403bb666917f31df3820af9ffbb846b SHA-1: 7277bd0c2a915098809b2da92eb20d87ec847641 SHA-256: a179b7d3aa43fc70cc4f92d2e836b9908bc9e9641efe2d9242cb180c8a62e061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern observed is the use of a PDF document as a lure to drive traffic to external, potentially harmful websites.

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 https://infrive.ru/uplcv?utm_term=war+of+the+arrows+full+movie
    • http://alpanelektrik.com/depo/sayfaresim/file/woxux.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920bcc879fa---69586103100.pdf
    • http://madonnina.info/userfiles/files/36557447017.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/23649957880.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/46iuku685la93fmgcb5s38af33/gipagumokolotuwafilipara.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/22a9f17a53a5d11f3724827dd1a2d10b/fomapi.pdf
    • http://www.stemcellhairclinic.com/files/files/jimokiponatezisexepade.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/budak.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v6occ5qv6gpdencrghiofd9f43/59828292920.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e391a258db253acd5db417ab20b6adf/lanavuval.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/45542ca9f105bd34fd7a9fd1fd43c8e2/58949410050.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63d0581ec---94699074882.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2476096c9f---dopugizelilugivapaxel.pdf
    • http://drivingschool-brno.eu/files/kumep.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985efb61915---lozegoraruvu.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/53814996877.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/babaaec807c1c46b3856f4107ce48488/libizob.pdf
    • https://rybczewice.pl/userfiles/file/8349177530.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93817cb092---30827840355.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce6daa378---92752973778.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b53795c84a8---lamaxevaxululo.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rmmtdp5si617smu4ep0rskbpa3/79287090194.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/zebafupepuvuravemagotu.pdf
    • http://driver-jazda.pl/upload/file/bavuroroximul.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/plag4p6ouq6b68obppkka5qm35/58140593813.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c03babbac---89862425982.pdf
    • 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_off0000e56e.bin
f86cc7aadded4bc2ccab1ff4b23b79796f2396939d5c17fcba6016d838fbddc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 28904 bytes
font_01_sfnt_off00012092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 16792 bytes
font_02_sfnt_off000138a9.bin
af3709e690adae1b38dfa57c7dbf9be42745204505319dfb69b31d90357d01b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 10620 bytes