Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bee753c24876c8f…

MALICIOUS

PDF

92.5 KB Created: 2021-07-15 21:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d94d89558f146f4a26d24207fbba8f93 SHA-1: f3a6d1692d93cd6a34d7a24ca017ca8f87cce7cd SHA-256: 7bee753c24876c8f67971d49d36f99aa292b56b0cccc7bfd84879196ad1a0146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078876f1079b---88245028975.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/retekakenijagoxoladub.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9f84e27c---61197508325.pdf
    • http://bulmarconsult.com/files/wasujijatuxogip.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef43c3a2eb---newetejogibamen.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9ar3at5r05m5dttuulgmljm0vv/zemofajefewagip.pdf
    • http://twxcd.com/img-aim/files/4654722691.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a259eba1---90718197315.pdf
    • https://yingzhaoliuart.com/upload/file/pokifitapejivolezik.pdf
    • https://mauspro.net/upload/files/77125764980.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c22e25073---48879677487.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071916f11ce9---90222747420.pdf
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/mojaki.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/7434977878.pdf
    • http://ekolojikweb.net/upld/userfiles/file/14750984296.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cff48c45---7505319104.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/9603089706.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a134c864b139886d03fcfa1ca7623fe2/vutopotasixuriwa.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608581c591e9b---duvevimujisedekapuvuga.pdf
    • https://longhoang.vn/upload/files/neriberobaketofolim.pdf
    • http://kme-kme.cz/files/file/vifumaki.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9mg9ppu67fq5pm49s0eb4753eq/fevunefadixanorujepadep.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/87475008764.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/danilafivavobunu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=discovering+our+past+a+history+of+the+world+answer+key
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86f.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 16140 bytes
font_01_sfnt_off0000fdeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16792 bytes
font_02_sfnt_off00011602.bin
69da69112964440da15285015fa5a6459f93ca789b207fbb1d315f8eb18a00b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 11356 bytes
font_03_sfnt_off0001309e.bin
7905de1337af964461d2ebde021fd9fca0cd6826d71da2864e49b9a81f1118a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 19908 bytes