Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa7a12d6e6a08d9…

MALICIOUS

PDF

82.3 KB Created: 2021-08-19 09:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52576a372589762944cf973dcdc7844f SHA-1: cdcf7097bb10e02906e4bfed5075cf170aea4aa8 SHA-256: aaa7a12d6e6a08d9b8f6bb7d5edfaca6242d1fda7b2f749c5db8fe7592768e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://philabc.ru/uplcv?utm_term=file+manager+iphone+4+free+download
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16087a722d3e51---34757147100.pdf
    • http://lubrifianti-auto.ro/files/file/menupisegatavapatiwosuwu.pdf
    • https://eyetracking.pl/userfiles/file/53860005614.pdf
    • https://smaransaving.com.np/ckfinder/userfiles/files/tibigavepavapuzadutur.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984479f18ef---juvurilekudugifunukulod.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/02eb7cb97d082389786fff38539715b8/13100836312.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1b4af5c7483ad3c8044b96b54eb6e09b/65158247621.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/af9s59qm9sn9ise3g4b71kbeu0/25286842943.pdf
    • http://dagmare.de/userfiles/file/luwuvurakino.pdf
    • http://flightshop.jp/images/blog//file/rasitirowalujogegopomusav.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/et7m0uahoe9rljko29qb0054cv/jiwurijixijirugizato.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7f1df3228e2e20fd14d056f65037f944/bewexavawol.pdf
    • https://hotel-la-licorne.fr/userfiles/file/bemifubamupiloni.pdf
    • https://egyptsuntours.com/userfiles/files/35247403192.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c692749425a---sirosadox.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/25100406607.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd24c8cd51---56815453869.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/025a2035b06dffd8563672821324e549/86929837916.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf2c22554---64668751321.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/07d710402574fc91175b3295e37111d3/59425985395.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ac3a49c5---rajonamexaxoxudegize.pdf
    • http://the-bom.kr/upfile/files/pubujiwanufamiwuluxi.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/56c67c55d8630d7c3562fe209c0ddf5b/pemidobisafixadofiri.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4a53e513dae26f4f9661bd9cded10131/lekofexipemasov.pdf
    • https://cleanenergy.mn/uploads/files/83585258065.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/melopaxemorebuvibi.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_off0000dd81.bin
49e47a147d413e97168ee9e59191489fe112a000f0f83220325b058278ef4b9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 17252 bytes
font_01_sfnt_off00010aa0.bin
4221c137efaf5645bd204da2601d05d999ac4c01412265271bce0eaec23e3e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 10820 bytes
font_02_sfnt_off00012324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes