Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8b84ff40610248…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 00:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39b822fb12bf5e83f0ee3b9344a0a0d8 SHA-1: b521b27db57d324cca396e437b5114f7bec85664 SHA-256: 5a8b84ff4061024814e47080d95e968a04fc0d539b0fba7f1ee81b700a70cc38
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://davidlbrooks.com/clients/868292/File/rofasosezoj.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9e662d5c---65523979655.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b5d01f08ac576bd75af2371f40b84865/tadaw.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/2016451538.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4659e46d2516bfabdada1697e575f498/muwimupat.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e37308834---vabix.pdf
    • https://altonika.pro/files/fck/file/setukebixegumefoteb.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/af04a68a4883310d642926e124cdc1bc/xazaxuvanud.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb6321efd---89202092043.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/ropikug.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1212009db506f90bade538ca5b16da44/vuwisezosupilolidunov.pdf
    • https://alves.bg/ckfinder/userfiles/files/76673221542.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160903503c60c2---dupenotuxixalifuku.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081941003586---wafilomot.pdf
    • http://poorclarescork.ie/images/57268772355.pdf
    • http://erex.hu/upload/file/kabakediwowotetaxivike.pdf
    • http://yejida.com/userfiles/file/16207124960.pdf
    • https://its-bulgaria.bg/files/file/kufoko.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d62240902e9---84370179542.pdf
    • https://songuryazilim.com/calisma2/files/uploads/fagudivagoxotuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=coc+best+base+th7
    • 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_off0000e672.bin
6b10c826ef247d90f977e4b8053df5657b29786330058aee30fa189ba8894f12
pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 16876 bytes
font_01_sfnt_off0001123e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 16792 bytes
font_02_sfnt_off00012a55.bin
0db8c610b2d3045d6c81b3f511d13847b3c6e63fabf5cb5e688083955328fcfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 10208 bytes