Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2acfacb7b14649…

MALICIOUS

PDF

93.6 KB Created: 2021-07-15 12:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 529b87d3762c5c5ba68a8b52f8902d59 SHA-1: a9bd882d513aacd6eb7901d04e1bc063375a9b05 SHA-256: 5c2acfacb7b14649626d0cdc18ff6ee70ee10ce205f2d2d4db8a920c40463ad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its embedded links align with phishing and malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://forter.vn/hinhanh/file/dojavaninipepamoso.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/79eff258d7fbed87150b31a4d7b44a80/58335661963.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d989ce8e48---25043120634.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b7548113b985e7e93ed3eb199a7ce9b9/91485911139.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd2542266---velawamunisutosejili.pdf
    • http://longvu.vn/Images_upload/files/wuporajola.pdf
    • https://asthasupermarket.com/userfiles/file/meruban.pdf
    • http://bachtungcompany.com/upload/files/48323839838.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/69b3f8f95f07d2cb1e33afa77bb5f2d1/75743421158.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/91eec47baa73601dc1fbff022a1987e4/sizaraw.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e70e2b98---zawarolufov.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8ea9b0e7---97454583088.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097acdc87503---nonakoxovaxexawulifu.pdf
    • https://emauto.lv/index/images/up/file/sewutebojaselu.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721931ecbcd---46502649737.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/79f66d1d1db6ab1b3ad4e70ae83d6926/78544201998.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3b93ed30fafc8a9e7e3ce7b337ebb82b/23086598052.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2f58c30b91e458130fc9b9a44040cb63/32960785048.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eacbc99eae---nekarawimer.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/tojifemozudubo.pdf
    • http://bunny888.com/ckfinder/userfiles/files/wopiniwivexinaji.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6lp7oeecg5h5s8fidtttt3nu5a/37811619670.pdf
    • https://bczenekar.hu/files/file/sisumazo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=let+us+love+one+another+song
    • 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_off000108f7.bin
d143d91655828a262e8d833e9a92d9f1c7b31fe6e56b35f067877daa60dd0454
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 10416 bytes
font_01_sfnt_off00012099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 16792 bytes
font_02_sfnt_off000138ab.bin
cbbf6d3e60050d7262b640dbf0f0f81a154fe17131a34dcb7282b96f6d98f60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 18072 bytes