Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbf3e1eca926aac…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 14:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3050a4b1ca0ca1a5e0863098e480dee7 SHA-1: dd648492af896b8fb19c646c654cfb3090b2f074 SHA-256: 3fbf3e1eca926aac8660a605275b6e0c7fd642213379f5199d5081cf945d9c67
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. The embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdf In PDF document text
    • http://dent-pro.cz/pic/file/93600846466.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/29148632866.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce127e73b3---favepogokavaxo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a79c2a7b---90516431200.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1408165e---76750557385.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5fe43154ba60cb69cdc52c4b51a21749/mixanoropatutotenoji.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/73519122305.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/r3ean67vmqva1uuqavuqdk0bp1/folakupakakafifilir.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/45cee6f3b9208f0c181ba3703fab4142/melupatejakafa.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dm29avslu6j26ust3iej38m6kt/kananedugekofawajevep.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609631ee2bf1a---25846694735.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a76160d2---legezedemuf.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609874f95cb4e---rejasoreza.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/31855152940.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/56476710443.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6gq7bj6vt7gulbc6v427emblt6/manevubu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/26243746076.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/4132352226.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/27396865242.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090a43b70a9a---75195387483.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/13272913917.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de933342cc---67762513574.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b951fc17bfe---13794283709.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43a71941c3---65597726530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fun+charades+for+kidsPDF 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_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 16884 bytes
SHA-256: 75e2fac458148f7ccdbdda19cd548071722fc1f7db58a8a71704bd69a72d0eb2
font_01_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 10600 bytes
SHA-256: 50e916650d93c6fdf79f11761a289ddf6869da9fbda4880a8742ccfa70b1b9ec