Malicious PDF — malware analysis report

Static analysis result for SHA-256 838c0dc0706f164a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67f821c981da9ddc5175258d8df324e3 SHA-1: 568e174ca797612c623f29236b99be3a755d4bf3 SHA-256: 838c0dc0706f164a9bcdb810bb554041a2cf2a5e130bbffb7fdd500c067e5c3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/hqe1njp49tjbuuuav9mj4hplpm/tizilimufesibafapibopor.pdf
    • https://myshalewell.com/userfiles/file/jogidagikidirolarufuwaf.pdf
    • http://galettedesrois.eu/userfiles/file/1556354807.pdf
    • http://vindindex.nl/images/uploads/kumumusarom.pdf
    • https://holocaustresearch.pl/nowy/photo/file/dujofovaraxigigenubutas.pdf
    • https://altaitur.com/ckfinder/userfiles/files/mijitagiboxewa.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/raziguzajideboretuwuper.pdf
    • http://mmprogetti.it/userfiles/files/20375044952.pdf
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/sarotedewu.pdf
    • https://bhsbeacon.com/FCKeditor/file/79922963021.pdf
    • https://cryptobasics.biz/uploads/files/ditovomaxawudolinap.pdf
    • https://giasidaily.com/uploads/userfiles/file/segokikujofaxidota.pdf
    • http://hanyangsteel.com/files/fckeditor/file/194533981361335dad6e64f.pdf
    • http://tiszaikaland.hu/upload/file/jojegemefojevanegipon.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/86620728000.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f0ca3d4c---temebure.pdf
    • http://vivaibonomo.it/userfiles/files/peneme.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/59268617136.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ab6047997eb7105cdc5d99553fa7df8c/60857531663.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/murezo.pdf
    • https://rinducm1.com/contents/files/83839799840.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/73208266136.pdf
    • http://ecohort.com/userfiles/files/zasinebowutogipabivo.pdf
    • http://alliance-ic.ru/uploads/file/29295784231.pdf
    • http://dongphat.net/upload/files/78417329821.pdf
    • http://lukinserv.hu/file/gadaloz.pdf
    • https://ontogepszerviz.hu/editor_up/69320416043.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aezakmi+gta+cheat
    • 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_off0000d616.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 16792 bytes
font_01_sfnt_off0000ee2d.bin
c56e0939cb219e3cc4401c67ce9c58a3ab7ef78fbd95dbcbaf587dbada4e8165
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 10272 bytes
font_02_sfnt_off0001055f.bin
8f94c7869daa3e6d87798e2b628d464b2496bbbd3a8b1d92068bd7e8554338aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 17356 bytes