Malicious PDF — malware analysis report

Static analysis result for SHA-256 34052a5adf16c7e1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 19:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2017cf6d43b2571b1272ef26692b5be SHA-1: cf6d57f00efeced89d10a27854aec5f3b592bf1c SHA-256: 34052a5adf16c7e12a72bb06cc291ab8fc9699b673aafca5c5021d4d71d4fbec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=how+to+download+apps+from+play+store+to+sd+card
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/87851754063.pdf
    • https://medsplus.us/admin/images/file/wofaxaxapejozaxa.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ba2321df311c3d740a17dd8b1a456962/20513774054.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/bozugajajasomedabujejav.pdf
    • http://curvesncontours.com/userfiles/file/xekebekuxudadil.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/sigefoxokijoru.pdf
    • http://www.poliklinika-hb.cz/userfiles/file/vojidukaxaseti.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437b1a2757c---garokimawimekesela.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/punerodet.pdf
    • http://ayurvedicclinic.org/userfiles/file/11380594415.pdf
    • http://lawngo.net/fckfiles/10636051450.pdf
    • http://form4concrete.ru/pics/cont/file/98337508554.pdf
    • http://kientrucnhacuagio.com/upload/files/rizinofumuxo.pdf
    • http://novafish.it/userfiles/files/goxerogonefiladovun.pdf
    • https://suacuacuontoanphat.com/upload/files/19037150512.pdf
    • http://nazycakes.com/userfiles/file/44342001378.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/radebekipulapi.pdf
    • https://protum.se/file/19625361468.pdf
    • https://siemreaptraveltours.com/userfiles/file/43428489231.pdf
    • http://protetyka-lublin.com/images/wyswig_images/file/poruxokogekub.pdf
    • http://lamorenj.com/userfiles/files/7750709567.pdf
    • https://www.utn.ac.cr/sites/default/files/files/sidibatogonixigefedet.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/660e5e7d2133281f2aa525b3187cd59d/lebadekadokenulawosadut.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8d93cc9b---34077155385.pdf
    • http://reguitti-engineering.it/userfiles/files/sokuludotazelarige.pdf
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/51809798099.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_off0000d97a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16792 bytes
font_01_sfnt_off0000f191.bin
856169ec25cf0d8b6fe1d4f9e80d4a0aaa71553c69094e80140a5ef3ab079859
pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10880 bytes
font_02_sfnt_off00010acf.bin
f3f8dcc68f811cb01322a7334b99e8fb704f98a3b8fff80864cf42eecc67a49a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 17656 bytes