Malicious PDF — malware analysis report

Static analysis result for SHA-256 884a0fef139d8c3f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 07:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0661f68e7483b17098a75b1b6432c484 SHA-1: 3d5389d379391a9195a6f64e7f65e111ca9abfaf SHA-256: 884a0fef139d8c3fa4bcd336280c905db037da9dbb96ab6b7142db4e8cd94819
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://muguet.fr/sites/default/files/file/xipemek.pdf In PDF document text
    • http://mariamozharova.ru/uploads/files/90605237760.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/58286405635.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/42i56b12h0v01kekfbe80ddfh0/18108421158.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/norazosegobasupek.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a4b1fbf9---meduzipawufupi.pdfIn PDF document text
    • https://faceless.me/userfiles/files/werizufuk.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/57597247314.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nojesudegude.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/m6rej9ft45eq05spi56m5ftkgt/tidibizevejotobanam.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092d43493160---44633501784.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e1360d0eb69938f4f1f52f1dee77b5/26761812881.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/gabimunovi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/betaribapajolojupewen.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/xajar.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/venanavizofudav.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tibovozuviv.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/fikasegodokovawuwef.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c8a54c4b---44103639703.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b3a87c3e08eef1968837e29318864b9d/budilezafagi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507230101987696.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c388da6c34f---jomoboketogoxew.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/suwunu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c88c5e0efed43331f4a2384eb2c040d2/semomuxidefujamu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/suwaboxamujikavetonuzumu.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/61868403280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+marketing+mix+master+the+4+p%27s+of+marketing+pdfPDF link annotation
    • 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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 18212 bytes
SHA-256: c9be7a20ab99189ef3009caecef20771f654abd69d682922bf695ad544779172
font_01_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 11168 bytes
SHA-256: 1cc84bdc476286558873b9de9b75a10d2be08741382aab8a7d0b19a0122fc878
font_02_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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