Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7abd16e4135dfd8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 06:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80790281d2a267a93f844c42e209e9a1 SHA-1: c46c83d5b97f5409e1417ba13d3b420f25726929 SHA-256: c7abd16e4135dfd859fe444b969c0a0d58c51efe17c29f9c196e31a758b98bac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a common tactic of using documents as bait to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=adventures+of+tintin+comic+books+pdf PDF link annotation
    • http://vitalenzyme.com/uploads/fckupload/file/61001384839.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/lefalazenexutojinud.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/dasimamaviwoz.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/zuvukewen.pdfIn PDF document text
    • http://klinok-saintp.ru/files/dofojifenaxaju.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/xenevurebuton.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/54491565473.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/25922325433.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613038347c0cb---21862647157.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/52310645290.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/gepinowuzedal.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/xixidawirapa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/95710a88ba729a1a4ccd777437ac3273/85442562042.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/lebuxilidanuwobaraxijal.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/felejemebigalepivomipidej.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109181646531027.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/32167075973.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/sekozebataxonikageg.pdfIn PDF document text
    • https://netlandschool.cl/files/95330597444.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hijjeh0hebjsimpiigl8716hoc/mibuberemamorogijawu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/15720245622.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/digixijit.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/tinudagigevixiz.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_off0000b1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 10952 bytes
SHA-256: 9f5575c4a98a2906873346f4c106ad26e0bbd0e149814da5afd6fba19d378dc0
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 15932 bytes
SHA-256: b332c4d3e099eb53bd3408ea1940a7009b67e4fcb865c382a0174e634a57ea34