Malicious PDF — malware analysis report

Static analysis result for SHA-256 f939c573f56ffcb6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 06:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9ad0f599e20405507ac3dd47129bc12 SHA-1: d1894b96c2371792b8f160e20ac5c639a28cd72b SHA-256: f939c573f56ffcb6559dbca7c9187b11d26272501f042409aa63df3b0eab5043
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'QR-code redirect lure' heuristic suggest the document is intended to trick users into visiting these sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=how+to+share+app+with+wifi+direct
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf310ed2d5---35485775552.pdf
    • https://musluogluotomotiv.com/upload/ckfinder/files/wudepodafatagenakofax.pdf
    • http://goforthegreengolfpools.com/userfiles/file/xusawusogivigumepudej.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/wojokugazinedegijel.pdf
    • http://cpghollywood.com/userfiles/files/24514580924.pdf
    • https://quanghuydulich.vn/img_duhoc/files/43445063343.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe00e81ef2---80933280214.pdf
    • http://rentator.com/uploades/fckeditorfile/rumaxatizevu.pdf
    • https://iskoruma.com/upload/ckfinder/files/zejefokutawopovosuwixof.pdf
    • http://slstudio.it/userfiles/files/55005633887.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/60462624132.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/vodovivevoximojaxomub.pdf
    • https://geya99.com/ckfinder/userfiles/files/6039975876.pdf
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/30439036327.pdf
    • https://amt-alarmy.pl/userfiles/file/luparepefolanit.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/bapefumodofare.pdf
    • https://pvcmikser.com/upload/files/timuparami.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/8207590961.pdf
    • http://inspiredindianfoundation.org/uploads/96035407357.pdf
    • http://grupophi.es/uploads/files/diletuja.pdf
    • http://indcms.testingmachines.com/images/file/vilubijixop.pdf
    • http://allprintusa.com/admin/images/file/44954442524.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/le9c65m158e8l9p1gv9f8svjuk/30164063947.pdf
    • https://juvelyrikoscentras.lt/Files/file/tajesubalivibupive.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_off0000b341.bin
e7b44b3a38128c20dad2feb5a25efa38359302fa4415401e688e382dacc087af
pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 16912 bytes
font_01_sfnt_off0000de8d.bin
76bf91455769a2f7dcdd9fb1a62a284ec391a3fbf90de158a49a3cc362bdab26
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 10644 bytes
font_02_sfnt_off0000f71e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes