Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8f97e9ff8cd5c1…

MALICIOUS

PDF

92.5 KB Created: 2021-07-22 02:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 889b241399b606c073fdbf4782b12ed3 SHA-1: 7876042bcdbb75dd4c31d8ae5bd18e10d4ea5ef9 SHA-256: 1d8f97e9ff8cd5c19ebde04aeae378fcee667c06d1e7f3c3c5c2dcc44687a0fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pet-fashion.ro/mm/file/tusilakexamufedugetuj.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e409ec8297---libenilulopabetuboge.pdf
    • http://www.motocams.cz/ckfinder/userfiles/files/35237907669.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/molosamugebexen.pdf
    • https://chptravel.ir/data/file/53951598317.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e5c42c2e9ef78b00efe9c58db507580a/55116791145.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qb7fqmjhk91vd6m34lda7lpf2h/2817482472.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/80f7c1d624a9359fc5033c84b1f87891/fariwelupiboniwoziwufaj.pdf
    • http://ztkammer.at/uploads/file/damosegim.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701568bc02b---gowujov.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d05a9073---jomopobopibidiges.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/sifiwodetiruji.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade8520af---fomakavusutirara.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/27d755954773f937dd8e7d2951229f13/rekawukigese.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1780a10613---bodegutenalibimuxufuboved.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c21714181e6---83924545593.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/juvqnulgs0jc566knasf8fr521/36638832487.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/741d9c6219c5fe236dee7d6786930f36/gusilipetixagopa.pdf
    • http://traiteur-ribot.fr/userfiles/file/65347283405.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/83297292700.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/53014139109.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=guardians+of+the+galaxy+3+groot
    • 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_off00010319.bin
4d800704aad13ad4f9450168f8741058b34bdf774f029bc0294a839d5caaaca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11160 bytes
font_01_sfnt_off00011cf9.bin
c45de654e4134f892f813d1e57174b71fee8675d3752a1766f77efe1fc64777c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 17812 bytes
font_02_sfnt_off00014bd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 16792 bytes