Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec34ec9687a2233…

MALICIOUS

PDF

87.7 KB Created: 2021-08-08 11:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca6d575feabe06db0df677129259d852 SHA-1: 76a4fe0e71bcfa7f04bc1358a0d949f1eeff2767 SHA-256: aec34ec9687a223332f13f1ed7f0f9c11d88cf8a98e41836a6835cfda21347be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous URLs, some leading to potentially compromised WordPress sites, suggests a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick the user into interacting with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80bdedda3---77771920989.pdf In PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/25543179779.pdfIn PDF document text
    • http://fgosvo.ru/files/files/jojusedelopititefu.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/97211389962.pdfIn PDF document text
    • http://hanleyresources.com/images/veranoxuzizerajijikobizo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/solakupekerunibo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceac2523db---64989653949.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/81458659003.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/9e038c9ca47cd5e232032bedaac567f8/funixazokovopafejuv.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/selagago.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/67555736155.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tetufedekiboledug.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/4342606052.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/kujenoj.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pu17tfpgeq9jk5h6qn0qj3mq07/tetezosonukog.pdfIn PDF document text
    • https://lemanssrl.it/file/95319708442.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/90795331568.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/74544565343.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a4eedcdc---mamevakeluwaruv.pdfIn PDF document text
    • https://banghenails.com/upload/file/xavetilufiropowoweko.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/rubelovufagubibogiguze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pjb1an9618iopm4cv7gop31gg3/famakeb.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdde61677---nuluruse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ifrs+15+exam+questions+and+answers+pdfPDF link annotation
    • 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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 18040 bytes
SHA-256: 51941e1e507e03db00b8fa36fd84128a65ff4ada0d216712dc4113ed4bc432be
font_01_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11184 bytes
SHA-256: 3ada912cab4d998d42ee92a1921dd5dc0462e68811a2c05eb5f9255304b33d2c
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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