Malicious PDF — malware analysis report

Static analysis result for SHA-256 5541d2662059a09e…

MALICIOUS

PDF

78.3 KB Created: 2021-06-26 18:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f19f807b3b39b637c857c0c5f1284ab3 SHA-1: 54f357af58745328049a063f741e4514233c05f5 SHA-256: 5541d2662059a09eaff68fa6a55ae3ae57f9949ecb4ed5f8fa1dbc53ab46380c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/5cdc5ed59f80dd42426cb48e651b4119/rowezitetokimaviniriwesu.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d635ac5f0---99181892030.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f504e7fc1221eedf59635b3bd547b454/17669095239.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7aae6203b---89212765246.pdf
    • http://palaciodelosnavas.com/userfiles/file/vugejisevovilobekube.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a0b80cdd65f1fbc92814e888c5768852/72706507033.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b0aec44120e6fa82c89220fd2face01b/30385844302.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c498198a92---75019010972.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/19de95d9cc9f028b1b6e41822857128b/97712924808.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcb943b00---ralimof.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160789f78a0d06---rurobizipewuwase.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c428903f45e---tiwexurufefot.pdf
    • http://kotolantopeni.cz/file/96910537391.pdf
    • http://aweibel.com/Photo/file/todiwi.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d44bd0fb428e64b0ac48def2cedfcc0f/77669346654.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ecgh8758ndub1kepln6g2ikgu0/48935959309.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50e60085f---gukolofenomozupid.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169c0d405---kimavitivixeferobiji.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607742cd0439d---tavokawudavugodamom.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812039911d1---89013666798.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/87798039668.pdf
    • https://hoakhanh.vn/uploads/image/files/fubonulinulokusitur.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9cff4dee561f20237f52427b08b93eae/49016501989.pdf
    • https://amitadevnani.com/userfiles/file/wifejizab.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e9ec6f51---tefabu.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087402f77daf---bezupe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=multiple+choice+english+comprehension
    • 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_off0000d025.bin
b4b9c2a5613a531b5e2d909f7f3e882ef06809c63e2b6bb4badbdb71d6101712
pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 10752 bytes
font_01_sfnt_off0000e8a6.bin
5b06ca3316b31b33853064b8ed74745c1a0a9c7f35702257b6160123e5194d77
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 16728 bytes
font_02_sfnt_off000113cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 16792 bytes