Malicious PDF — malware analysis report

Static analysis result for SHA-256 1172af74fefe94d5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 16:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 974c5afd4dfb31ab2f6c68c52b440f5a SHA-1: 5486949ed974438666ed35a27ac45f25866d0da9 SHA-256: 1172af74fefe94d5a958fa04c1721f293e9e87305df85ac52adad4ce00d40f21
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of links, many pointing to unknown PDFs hosted on various websites, some of which appear to be compromised CMS uploads. This behavior is indicative of a link farm, likely used for SEO poisoning or to distribute further malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://takipcisec.com/calisma2/files/uploads/68806799264.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/zelazixane.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/68e9e9f3da7a5546e506060cc4f11aa3/48182155309.pdf
    • http://ackerviewguesthouse.com/userfiles/file/74584408493.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/rekilezawewapelaj.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/vavizetupewopomun.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e92b2b0797d---1809044027.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/raropufidofidozanafu.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/fokapezilojilovunetozo.pdf
    • https://stiff.pl/ckfinder/userfiles/files/monozevogu.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8bc6e7f7---25357683507.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160876e6192feb---vanibofi.pdf
    • https://edarky.net/data/file/jeredawifukaropefida.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/355d5fa0778f9d2399bda736296bd178/sazujekazi.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/20882073394.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3a10b339efb964c948b67a60e39f5ddb/zimegisi.pdf
    • https://vivekanandbawwa.com/userfiles/file/73728401430.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82e70d88a---13407407469.pdf
    • http://ks-puyuma.com/CKEdit/upload/files/45921765768.pdf
    • https://rowsontw.com/shopadmin/upload/files/38909015734.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c979262efe4---zosexadizowajafumevirajub.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43e9ee8a5---wugufudixugeriwozulem.pdf
    • http://exosushi.com/uploads/files/lebilelo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=angles+in+parallel+lines+gcse+exam+questions+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_off0000c5ff.bin
1ca995e72b5c09ed1e7c272f99c8b2e227ea977f572c7d2a822cf2b7f81c9a38
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 11292 bytes
font_01_sfnt_off0000e007.bin
92f2fac16296f295dd255591e2b2d9c75d2c93d53e08364222142277e4fcb182
pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 18452 bytes
font_02_sfnt_off000110b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 16792 bytes