Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c750302ff00f67…

MALICIOUS

PDF

84.1 KB Created: 2021-08-24 17:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3088a77d048f095ef33bde5f2c1f902 SHA-1: 17ec68b92651c0a008b7df9bb20529009a135a0d SHA-256: 40c750302ff00f679aef33c25bb80ee4664c6c5de22221f19791ffe8f6598b0e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary function is not to present information but to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://successalpha.team/upload/files/masulosaxolasotazavijoz.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983479c15c---tejakopedafasa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349fc6963d---gutobanukasavebareleno.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/rulux.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/fetazijirupu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/27122031824.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/m6j05kkur4urgdhfaa301asd5k/litiximomawut.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/legukifabidopurivure.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/63706890073.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/88978306760e63068d49ed.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88633491155.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/52797dfab0f7c8e2ea16c3ecfef63335/wamunegudirorowus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffbef023c9---40526913598.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/vididotivipibexaguvipen.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f371e06e0---nazorakusilamo.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/20474731465.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17eb2890db---pusavuvazuzivamebadakurez.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/legexobawubifu.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/12554860857.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/womozelirikul.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cb63ef056---jafokovimamiruluwilo.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/19181724490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+endocrine+gland+that+controls+homeostasis+in+terms+of+blood+glucose+levels+is+thePDF 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_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 16692 bytes
SHA-256: 4134ab32965851f3d9faf8f6ac06415ab74630c6e601b65a8bbcb71e76801bc7
font_01_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 11192 bytes
SHA-256: 9849e250de9df384b52493e77eb3b7e2a6359f3b9d84c2cb40d8904277dc20b8

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