Malicious PDF — malware analysis report

Static analysis result for SHA-256 a111f41f2d01012b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-29 05:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47969e6ca933e4032ae08a23102ecfa7 SHA-1: d13756e271cdb3466749369194232153e4bf8b4d SHA-256: a111f41f2d01012b306c2f120f2da34f76f61cd945d6d7808225f1cb942ba21b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://alpha-cp.com/userfiles/file/dudorigotazagubopake.pdf
    • http://onlytech-tunisie.com/userfiles/file/devozuxuf.pdf
    • http://ibrahimalsada.com/pics/file/xijat.pdf
    • http://go-pxl.com/uploads/files/vowiwujesejuxix.pdf
    • http://emannsltd.com/userfiles/naluwi.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/kenawesiwibileroxaro.pdf
    • http://www.s-prom.si/fileupload/file/374268686.pdf
    • http://www.leasebridge.com/CKUPimg/files/48294639177.pdf
    • https://karinbentum.nl/uploads/file/fixelivotag.pdf
    • https://eminencesolutions.in/resources/userfiles/file/tutobeviwemifewibusit.pdf
    • http://retrolondontees.com/userfiles/file/94244727263.pdf
    • http://savemaxint.com/files/file/50319718085.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16150a524d4b3c---50912265297.pdf
    • http://faceconnects.com/ci/userfiles/files/77504449127.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/r17ktvehkatnkgrbg8ls8rlmdm/natonelemamewoda.pdf
    • http://vividconcept.in/userfiles/file/10422949047.pdf
    • https://unovosti.tv/ckfinder/userfiles/files/rojexoxuwefebuje.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141750b07b0c---doxusi.pdf
    • http://bijverhoeven.nl/uploads/files/44971804789.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/bolekodenefo.pdf
    • http://analogsys.com/uploaded/file/1525485642614010d824a18.pdf
    • https://sabresources.com/FCKuploads/file/mufunukoka.pdf
    • http://apartament-krokus.pl/userfiles/file/runexozo.pdf
    • http://mclarenquartz.in/ci/userfiles/files/32526560522.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94896681410.pdf
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/sejodopoguwebugidetavafe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=screen+share+mode+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79a.bin
5518edf2e8d10eafd626d37a24231e1e0f43131aa28266b96a7f2aed13f04660
pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 17948 bytes
font_01_sfnt_off0000e5a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16792 bytes
font_02_sfnt_off0000fdbe.bin
04dfa0271fd82dbfefdc9d904fa2539f639e10a4538fefc5d392788898397a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 10568 bytes