Malicious PDF — malware analysis report

Static analysis result for SHA-256 540151a1989f5a28…

MALICIOUS

PDF

91.9 KB Created: 2021-07-07 16:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba8a8c202aba4135ac8a3a587e452561 SHA-1: e627f00931c265a8ff783987639709b41bf830b7 SHA-256: 540151a1989f5a288c9acf4272decff3f2eb179935dd0752a58f778d69386d24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised sites strongly supports a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c589abc1fd---wunolaboba.pdf In PDF document text
    • http://anvlaw.com/userfiles/file/sefaw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16c88c2db---36552706878.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/xikezakofotipuligivolot.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m8cpir2fhef8odume7pm6fj24/papisor.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965efaab47c---60735238187.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/rufonakiwobegak.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/sofumukasitimuresula.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d209ab51---96552974056.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/ziravukevug.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8538b75a3a---49684103656.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/peruvon.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/ponezopugujaragorirajis.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/30773233348.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dbo5q1j7idekd2v0gvqqlcho75/fosolumuzutozarunowumuwe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac3679724---piriganuloselugoju.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/bodudur.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b121e3d8cae---59875144146.pdfIn PDF document text
    • http://orrizon.ru/images/file/wijeradoxebajabudu.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/18899928489.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/34852222251.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210630115612.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bba777f6be76b712ec438993acb74833/88950507642.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/tdk6ogjkcsoq2p566lsqvmqovr/kisifu.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f454054c3---44068261018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+increase+straight+arm+strengthPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 10708 bytes
SHA-256: 85fa91be62a1d9e3d86da3f7856063e620b6333e1bd456d51587618e1c06c053
font_02_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16996 bytes
SHA-256: 90c305fa8a6c901a08931d7f94f9bfab7bf185f23804cbbdded18b5da8a1b5f1
font_03_sfnt_off000149f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F5 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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