Malicious PDF — malware analysis report

Static analysis result for SHA-256 386de32e4526601a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 03:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18bc3f0c33b7c6552fec3088f6852eb3 SHA-1: 6b4e4e7cc26285f9cb22219a9f6a45f5e1e894de SHA-256: 386de32e4526601ac50cfe03eae5a5f56676538b56480f2e628f556f0ca9ca4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary function is to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=gunship+battle+hack+tool+apk PDF link annotation
    • https://sysyanginguvenlik.com/uploads/files/pumof.pdfIn PDF document text
    • http://ihdbd.org/upload/files/sesazemogusefolakikigara.pdfIn PDF document text
    • http://net-marketing.hu/images/files/xebanolesanutivimalegu.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/94025096548.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d95bfa40---fitawuwozafawobomag.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/69701802066.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/viterolekigesaxazizew.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///70217819682.pdfIn PDF document text
    • http://baoveantam.info/upload/files/daziwojobezuj.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/27884631974.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/37115380994.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/21253742485.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/timukojomila.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/forusilusabo.pdfIn PDF document text
    • http://vladekoservis.ru/files/mugidulixopumasuwuguda.pdfIn PDF document text
    • http://adveotec.com/img/file/kejenatexisuga.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133e292a810d---3890468526.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ef79e1f4---sunabifov.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/50022400058.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/dibaxulebagemes.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613315a7dbcab---bekuzopumubumomev.pdfIn PDF document text
    • http://nincity.de/inline/file/96743923818.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/nuratuxagokod.pdfIn PDF document text
    • 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_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16572 bytes
SHA-256: 63325192b81da44a0b23e35c607d36522cfeff73f58d1d75913f9b74e7cdee54
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10740 bytes
SHA-256: c8f2358602b43a34f5f22b65763a86cf413a4fd9fc0f85c8d07068657079c7cf