Malicious PDF — malware analysis report

Static analysis result for SHA-256 07821ddfb367c538…

MALICIOUS

PDF

79.4 KB Created: 2021-06-27 03:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c590a9b525b1485eac84ac6d9316ffe SHA-1: 7a95fb9b62c2fe3a45c5fc13f0f79d6ab64fec50 SHA-256: 07821ddfb367c53837029d237ff9ed8599dbe23fe1d81c7a16309fe914d5e15c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://adance0112.com/upfile/editor/file/xogov.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdb9da1e4---98384355012.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528223338.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3gt49vg7jlds4d6pmeojvffhks/midinetewokefisowibugeta.pdf
    • http://alisawedding.com/upload/users/files/lizasabuxixijuluzu.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f660ecebd18aa1359a733cbb9bf26f7d/58361427813.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8fceb622c26a473459db56c7f03be69c/fafasipijowam.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16084302c8eac2---wilubuxotikuzowito.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/b732ff67f67a421dc892dc32949c584c/21416508537.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3dae3f60a---99011797473.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a246188af---gewinirosedateneve.pdf
    • http://abwlanham.com/uploads/files/18375842206.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f4cf1ee8---mawabekavaramureve.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef053a2ef2---tisixijuxifof.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/db540577071e3247e991c908624a519f/dolexowanowawosu.pdf
    • http://jandebruijn.com/uploadimages/files/mokotimumirifulezoxuzaw.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f291ca0816---dojijotosukiwegaj.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ac41a306---lubinekogujiw.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dbbo6v4gnndiuih8qti1qqm8o5/tiforilo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+new+new+thing+michael+lewis+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_off0000d4fb.bin
3dcade927ae55c3e3a80fcd559bb4471252c446e103b1b99a33695dcd0f2fb66
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 10896 bytes
font_01_sfnt_off0000ede2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
font_02_sfnt_off000105f4.bin
634a93ae5767162d83046425024cc0a77cacebb6b5165078715b5880a3901b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 16396 bytes