Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1534c30559dc48…

MALICIOUS

PDF

88.1 KB Created: 2021-07-09 15:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b0b4243fe66c317617a301f9210ce30 SHA-1: 1eb9bf2218cce57ed3254a622c0f07b3d36ff557 SHA-256: 9f1534c30559dc48f03f37a9dc32ee0982974667a2de120f815d2bee9df785e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=rc+airplane+cad+software
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ad6df12d1328e6d8af3e9bf88f44f54f/63510326635.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609beaf8c6ec6---kawobepavovipu.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fc720d7cb---gubasulivejozupu.pdf
    • http://megaprestige.ru/uploads/files/68332021164.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160906410adb36---10513901123.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687afab1e0---gakarufigox.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/66188646369.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/93644f9a4ba2bb4e15f4d8b7d2945d18/14970196126.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bac271e7f---72316060770.pdf
    • https://bnbcostaverde.it/userfiles/file/pidadalemagejizusatej.pdf
    • http://diamond6ranch.com/userfiles/file/nozaxuravoliruxig.pdf
    • http://lt101shop.com/userfiles/files/duwozevijefowularadizike.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160852c127970d---53179216233.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0685ad79b1---diwik.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/nerupexibariwuseluta.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018dcc3493---40537406215.pdf
    • http://china-zzld.com/uploadfile/file///2021070402442480.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893f33d013f---25540501146.pdf
    • http://nappsa.org/userfiles/file/napidupizeb.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602073729.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607758b0c455b---vivunafexuvomesapan.pdf
    • http://doks-films.com/pcms/content/file/71322649406.pdf
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/20215710449.pdf
    • 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_off0000f4ee.bin
dfd9e14f33d49e536fb37e9d100b76b5c248ffce4b05505763b1bb1cde95339b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 17404 bytes
font_01_sfnt_off0001227e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes
font_02_sfnt_off00013a95.bin
9a42e54dde232fea42cdb711ee6bf8edf7f6cee0dc23c124eeed1d04d2ff22aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 10744 bytes