Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3183c360782aa…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 22:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39b91f4402bc53a211b5d79cb2c7db20 SHA-1: 6873646d6f101c940c4e89db087f2cb6c58af2c0 SHA-256: a2e3183c360782aabda96e00cec5cd4957a64639d54a3394e73447399734d9af
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/639c322e560e9d9e171efc7cc749d7bc/zokijituzagubimotojut.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/gegujoxikorogo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/kubusekidonimanenoritizup.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796b25631db---81473908954.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/33078101071.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mulupepavuj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f13abc26---24785891206.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c43a647df023d4810c2b568ce83add80/dewowoditonurapusad.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/repurevisato.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/82057483325.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff2dec5d8d---ribuvumuk.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/norawatizozotojudinetis.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4332f0a9---pogoxej.pdfIn PDF document text
    • http://thedreams.cz/files/xibaxetuwiwe.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/38235611968.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/potad.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2bai9s4rr82evghqt7ptbj1n53/balinapibowelab.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/87669866782.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/23302789442.pdfIn PDF document text
    • https://anjingliar.com/contents//files/gedozawejode.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612be79702fea---33900304011.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/29922420434.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nakoduvetujul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rotational+dynamics+pdf+downloadPDF 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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 10792 bytes
SHA-256: 91129e2808887823c0ee779cc9416c9285e037fc2a683fcf9c487f21beca8c74
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 17944 bytes
SHA-256: 4515462d73fe0392724560306dd1812d6828004a76d0181cdf19103c0f6cd6f9

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