Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa03f03b7068dae…

MALICIOUS

PDF

96.4 KB Created: 2021-09-10 11:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb4c8c53606c08a4f4718b5acba8c19c SHA-1: 1a23f3cf00e54ec419aa1b62630a0991f274ffa2 SHA-256: eaa03f03b7068daead710a712bdf0d3a40564dd570980b2d3892ea462d94ba44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on disposable infrastructure or compromised CMS uploads. The primary purpose appears to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=unturned+car+lift PDF link annotation
    • http://tlxzkj.com/uploads/file/05175347375.pdfIn PDF document text
    • https://artenika.pl/fck/file/tojedonubigoladorawa.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/vofuwusebonexe.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/buxarunimunabajafexija.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135655c5e8d6---5093929000.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/lilis.pdfIn PDF document text
    • http://hijoin.hu/editor_up/61004734196.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b1c4a81a---67160314762.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/lifot.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/24496620651.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/85430466798.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b469752c1cc30cb57377bc88262e237a/sadubuwegapexu.pdfIn PDF document text
    • http://gewald.ru/content/Files/poxezeso.pdfIn PDF document text
    • http://falconltd.pl/cache/file/52034536946.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8299f5c3acffc63fb99d654b7dfc0042/sunawuzopasupezidiro.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1sj9ook83haqd856k1ccp813r/mebaxav.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/88167454803.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/sefuja.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210909/1248507807.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/33317244373.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/25315797863.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/99468154048.pdfIn PDF document text
    • http://stisk.com/file/5478220167.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/80467348179.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 18708 bytes
SHA-256: 32a6c146888ef03d6b39cc7c922342288a437005c19a79d5d27563f2eea5d8c4
font_01_sfnt_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 10288 bytes
SHA-256: 845b5e2ce8ecc058d492dc3099c646fd6cb58dcaf5bdc14c35359f2a368788a2
font_02_sfnt_off00015b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1