Malicious PDF — malware analysis report

Static analysis result for SHA-256 52664421609b12fa…

MALICIOUS

PDF

82.1 KB Created: 2021-08-20 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d78d95cf9418b2ced5ea5c91f427208 SHA-1: ac08ddb652407698a2b51127a47c297629d61692 SHA-256: 52664421609b12fa89756a09d337bfb08fa6bdd32506991f54a8f0ba8c0e31b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains a link farm pointing to numerous disposable domains, many of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://rajakeempat.com/contents//files/95328941172.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c158fc3a848---44417744694.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb9777210---dufajawu.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f6e18319849bcc2a96c13a801906dd05/20879276241.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072f65bc120f---pukixituta.pdf
    • http://nowyhotelik.pl/userfiles/file/6286141295.pdf
    • https://skiclubraonbaccarat.fr/pdf/bixanuvepigasopiberowe.pdf
    • http://ausafe.net/images/art/files/rekokafisazidonomukir.pdf
    • http://aqbnb.com/uploadfile/file/85435174562.pdf
    • http://otvorene-srdce.sk/userfiles/file/jamagopupukaranobafubame.pdf
    • http://101-games.ru/images/uploads/files/marolipagawid.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2e1219ffae8aa856491ef0e7f0f58e08/lapugaxinipuva.pdf
    • http://agrobud.net/uploaded/file/98000126878.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d572a6ce3e4b332742a31b79d6c404c0/70377196246.pdf
    • https://sukhayurveda.in/userfiles/file/54512284551.pdf
    • http://cancercareresearch.com/userfiles/file/89182242665.pdf
    • http://saeronbio.com/userData/board/file/sudaganaxexulelobajiv.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/udfsphmdpdld16eu56n9vmne9p/zoxudilog.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726de9855b---77596359042.pdf
    • http://czdashan.cn/uploadfile/file/2021070805593673499.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4536d70671---ginugatur.pdf
    • http://miet-boot.ch/images/uploadedimages/file/73682823365.pdf
    • http://andlupa.com/userfiles/file/18087772685.pdf
    • http://matstravel.ru/userfiles/file/mukojelidukoniwizu.pdf
    • http://tingyi-bnb.com/CKEdit/upload/files/tatetitenoli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cuantos+milimetros+equivale+un+kilometro
    • 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_off0000da4e.bin
d47ceea7fe28784327d8286401db33f4862270b007257d425c652862d6d7b22c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 17788 bytes
font_01_sfnt_off000107dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16792 bytes
font_02_sfnt_off00011ff3.bin
8024a72a803961e0ac73e11aeff229f83dafd0b0f04fdb050742382bc7f9f3b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10704 bytes