Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a97b8234714a1a7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-21 01:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e9c2d88a55803ebf1552417dcd1eee1 SHA-1: 1a955b899c3a232d23ae512990e2c56f368ce2cd SHA-256: 6a97b8234714a1a788056efdb6885b42f4fd7c30309e364b2a28ca874b5f1fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. The presence of external URIs and link farms on compromised CMS uploads suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://archism.ru/uplcv?utm_term=how+to+connect+android+phone+to+windows+10+via+usb PDF link annotation
    • http://ghefootmassage.com/fckeditor_userfiles/file/58127938054.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/7731192166.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/puwaxojat.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/93700252669.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/virafufegokumiwes.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d50c3be59d8e7f5d399032495ffb0ac0/64908994866.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/17317128813.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/65955378564.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/38956913629.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/69957305371.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/17721030198.pdfIn PDF document text
    • https://cmf8.ir/data/file/jepupizanilutivovizamadom.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/14863324267.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/vizakelilimaderuwinin.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/vuminodikimexajiwagonibi.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jokonuvokasiburofowijup.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/5376888903.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/xuzapolikolojudufaxadov.pdfIn PDF document text
    • https://grouptm2.com/contents/files/suzoxix.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133827049723---84261025272.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/59cndc32n5b3rrf1v0d9cv8vvuno52a0/5479904872.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/13486613521.pdfIn PDF document text
    • http://gardatrans.com/content/Files/gonokug.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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 17584 bytes
SHA-256: a0206f340f897300020672f3a58723e01a4c03c44f106a8c85c1af58fab50356
font_02_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 11120 bytes
SHA-256: 7c3b4f4d0839fbbf5b4ad2c55b9fc7dc9ba68a436d07ea2025ccc70c45287494