Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae4716b9eaf645…

MALICIOUS

PDF

77.1 KB Created: 2021-06-26 01:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 171b25aa921bb193cb3258fcd0469bd8 SHA-1: cfe35345372d9b32d33cdb7fc444f54d9ecabbc4 SHA-256: c0ae4716b9eaf645250c6373722a3cc3b4a8cc50093264cc0f2464dc5b02b127
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of these links suggests an attempt to lure users into clicking through to phishing pages or downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gat-asset.com/CKEdit/upload/files/nebamobaxumotisepaxixer.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e722f33c1---20415695915.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e0c501fe280fd6c9935b3b657ab8e90/63133349176.pdf
    • https://premium-house.uz/images/file/zuduxawuseto.pdf
    • http://iworking.vn/uploads/files/54177428516.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gp0uja65io2n1j0uh665stia57/vixupanuxavasajopigad.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808aa1144f6---10787561642.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vufowo.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8coomsqbfr2dlvmgpesbi26e9n/xogodikuladugefesezu.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f6c3e107aaf9a1d5eed0090cafaf62ec/7949428670.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95a30cb57---49484902853.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47783487377.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c8f1ce3329836f3aa7e75a7c0b39933b/11248656082.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb30adc626---likopiwezarabevem.pdf
    • https://dodomacnosti.net/data/file/30888731602.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///rifofatapiwuwiwukumo.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbc1eebd---88413774573.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/404018b9d1014bd010c1e3d50ff9bbfc/vugurirajubovivaredilazi.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/43274588185.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b77842c4b4eb0a4f4d8d215d5f54ec96/94348233525.pdf
    • http://clairerolo.com/userfiles/file/xuzufaritafewaxamomageken.pdf
    • http://supermarketdv.ru/files/file/70915163617.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b78eac90---20640397272.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861a25284f---bajejerifosiguli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=stay+with+me+chords+sam+smith
    • 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_off0000c9f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 16792 bytes
font_01_sfnt_off0000e210.bin
6296729a4f35d2a6506e45811b86fc4a6276d93b1759315f0a6e35cb96543b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10760 bytes
font_02_sfnt_off0000fade.bin
1e2d89b681873afbb508668ee9d9a4346571de3d6c46614b78aea7ca59b23086
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 16844 bytes