Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb968be8969be9b8…

MALICIOUS

PDF

73.1 KB Created: 2021-08-31 02:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d73758480088d488e063c457f6f7a525 SHA-1: e4cc72c92c9dcf029a5d806e42fc441996eaec03 SHA-256: bb968be8969be9b850077000231c9f2191cc9569183f0611b054d4d9be8dc121
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://drafthe.ru/uplcv?utm_term=introduction+to+quantum+mechanics+griffiths+3rd+edition+pdf+solution', appears to be part of a SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=introduction+to+quantum+mechanics+griffiths+3rd+edition+pdf+solution
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095990d51733---29528495519.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b519c526e40---88314312410.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160758e49c0892---ridexoxirejava.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/povoku.pdf
    • https://handientu.vn/userfiles/file/vevemilovafuseliwuba.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/21273918004d7a2cade2a916b58ef96e/30739875622.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fc0161df1a078ad491ca7a6b5cd5b445/99908989121.pdf
    • https://izometal.net/mm/file/vuditivija.pdf
    • https://laps.pl/userfiles/file/5779438235.pdf
    • http://krukewittfarms.com/userfiles/file/binukojobefabunafi.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/h8tudchkijgqls8mrt9lg4ut51/pifiwofoka.pdf
    • https://nusbetaja2.com/contents//files/fixoxixowunonowavituxuviz.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/wezotesabosikivuniguv.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/l5nuromcgaa9880dq5tucuuj6c/12056481228.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4tt45ul1dhsndhh3lb6t6b45oe/lozikavenuxilipakir.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bae7f3d6d---65382628288.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wamixiwov.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f070b0f83---dujaregonovumajozize.pdf
    • http://xpressup.com/userfiles/file/gabiwozewigepo.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb02ae22f1---zumumanejusukixogirefenum.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/53730308513.pdf
    • https://mariellatriolo.it/public/file/82891279271.pdf
    • http://dlevitin.ru/fck_editor_files/files/76917852035.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/5g15anljv3bm6e6o42ctv34ccs/63809526560.pdf
    • http://rentbucharest.net/images/userfiles/44576982346.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_off0000bc53.bin
16706fbfad2e295b080986f089ea87d7098fb754a5e6851aa060fb7886a56a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC53 15764 bytes
font_01_sfnt_off0000e44a.bin
a53c5160b04cf6fbc5bd08ec008ddc93c0e0216c6acd75158d652b974f42c061
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 11436 bytes
font_02_sfnt_off0000fea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 16792 bytes