Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3db05cc794bbcc0…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 00:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5666179a3fb13fef1011f73bbdb5afbd SHA-1: 307ab97581cee60d4cd7fc80642fa69a35138d6f SHA-256: a3db05cc794bbcc00f011eaade8191c67c2e3ef5a5a8858cd337cda8b7b0eb9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mobilesamara.com/img/files/file/kobagodoroziz.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca64faff36---2932966351.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29a81fc09---judasipo.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abc1c57a1---39475498685.pdf
    • http://euro-ex.com/3075828349.pdf
    • http://campcolefamilyreunion.com/clients/82065/File/divivasabonewiwebe.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73b09ca33223334e6c26f97ddd20a80c/46230567614.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc14506177---mowujodovavi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be36da510f---52547536851.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/45887e96f49facbc484d37de7a91dc11/95571013738.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b2cbd1a1---lokefajujigikaketimuk.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160791d11235f2---tawixifovefipisuguxanopa.pdf
    • http://wisdomtours.net/upload/file/wiwezodabekegolazikugikiw.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5bbc6fad---xubojupuwitadakufogas.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbc9bb743---tukuwi.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e625521e355879e57d1c5bf81690c45f/12264809707.pdf
    • http://aucoindeshalles.fr/menu/file/fenegakibigulupunuka.pdf
    • http://cnex.cc/images/blog//file/37895694459.pdf
    • http://axiomestates.com/userfiles/file/nufajunelugizuja.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e2f037ab287db5f3da6683dbb26329dd/duxovobudekagizogapawuzip.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2af6cc2f703cd9c59b40cd0e7590071c/zukepodafakogu.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb7aaa9ee---wisuxunibexejugog.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vosixetinidejivotexeb.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/14d19b83194abccf39d97a658fe2cd11/98944604392.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=repair+escrow+on+conventional+loan
    • 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_off0000f45c.bin
95e7e31ff3294c3279c560b81108d0be8d6c156d4cb65804e2799230c0c22b45
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 17580 bytes
font_01_sfnt_off00012194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
font_02_sfnt_off000139ab.bin
88b49ab81979bd572db92dfbc61f1e3c936024f0b1e2415503e9032d55a29ab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 10564 bytes