Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3cab21b10ce2bf…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 08:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8026afab125105b4cfeac494d7fa4e4 SHA-1: 592e1e9911aa4b01860b87146df97c6dc9743684 SHA-256: cc3cab21b10ce2bf3ce5a8d288693571ba4eb686c63ec744b245c87b9f1422e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or further stages of an attack. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially delivered via spearphishing attachment.

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aje7410o2p4fd8n0ue3c4rof0q/52491966420.pdf
    • http://biotop-zamosc.pl/userfiles/file/xekiwezudumulime.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/66111603440.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/1673115121.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2cd79f1bded2a587a7fef9f2d15b63a0/70197446840.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b90a2c6b4---kunamosebamixijajuvabufe.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bda67e45e---moburitanifomupukobap.pdf
    • http://skomi.ru/img/files/file/nexebabemomokupi.pdf
    • http://meechoktoolmart.com/user_img/files/nanuketikakadeni.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9fe666600---vikusefabonimaw.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/81551036178.pdf
    • http://kcde.kr/userfiles/file/30143523944.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/rodazevefewuwusobebugasiv.pdf
    • http://atsrealtyvietnam.com/upload/files/47491390933.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2l6iq5oqmjbp8alqj96rj5uej6/wupomopibajarokuvugexofez.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1017e03ee---4831223033.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/dcd1271703e191562e6518b4fa88c9dc/55835577768.pdf
    • https://soechi.net/userfiles/file/18996377023.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a85b255c4d---46764828465.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a76be3c7ea5---12981072285.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/onj1qh4s5sv2snda7iokmvbcf5/rilus.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea30cdbc0---34210533948.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/65347028348.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/93011553113.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/30ab0e2b67c6d35604b394c126ba741a/nodutikoxom.pdf
    • http://adabaskimerkezi.com/upload/file/mivewanabidad.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vppd8n0vjpnljrktjrq0re0g52/luwuvivudoweteko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+infiltration+of+pollutants+into+groundwater
    • 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_off0000ef11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 16792 bytes
font_01_sfnt_off00010728.bin
abd966819ffbbc637e3004991d6f533a01261f848adf494c6f211c9f0c4f3b85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 10924 bytes
font_02_sfnt_off00012037.bin
e479a88fc1b6490cb59b34bdce456a2825efff811505f9311a019e74a870dc53
pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16892 bytes