Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff241e146791db1…

MALICIOUS

PDF

96.0 KB Created: 2021-08-12 04:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cccbb0a7e414d49033620797333211b8 SHA-1: 70ffdacd6588e69925dc6cdad0af792f00f921f1 SHA-256: 5ff241e146791db14ff617d873516d92df24ed507e3f95990b9a57396f3be5eb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://parilka.by/var/upload/file/xogamumunepibin.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866828b38a1---kigafozezimimiseji.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/sinogik.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/15050489016.pdfIn PDF document text
    • http://parishad1925.org/ckfinder/userfiles/files/nejadidanemutavom.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/49187df0eb9bb4996b73b83fe72f3c25/mokuzisukowevanidilarum.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/54762759758.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/35185446989.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/36887772279.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c813a4413c---32377690080.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627380530.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d9bb1b1af---rasoditazunodizoverem.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/07nkdrhjh9pti4qp4acrkjp70r/zezodisuzuzomuzovo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33c3bddb7---nowupemid.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/21607506161.pdfIn PDF document text
    • https://cape-electronics.com/media/file/40820435301.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2258d9650f---41968131793.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/56632250111.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/92522858097.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5dd9972baeeb44834cca0a277e04ae81/femim.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c55fe4e5d---wokufedixuvuwixesegamur.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dqigoiq3rh08knbevs2heok322/fudigasirafugosu.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6b896bd5552763c6bb1ebb0222ec658d/ludizono.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/25074351722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+things+they+carried+chapter+1+worksheet+answersPDF 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_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 17168 bytes
SHA-256: a6768cdc4551583b4b2776f3bcd021d34b01af074efeb6fe8503397649131c1c
font_01_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 11056 bytes
SHA-256: d992943623807b4715f72ef75dcc33544ba24e45aa7785f83164b70efeab9e56
font_02_sfnt_off0001581a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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