Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4621362e8934fd…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 04:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f582bd385edd2a4e0b9cb70120a2b94f SHA-1: ad6d34e6d536080c50cffa4e91603f86c6545291 SHA-256: 6d4621362e8934fd424607a5cf765b6273d5a4cb1ce96c01e9653ccc52d5ca86
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload. No scripts were extracted, but the heuristic firings and URL patterns are highly indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=stanzas+on+freedom PDF link annotation
    • http://soles2walk.cz/data/file/29595656680.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/wetekokuminatapuwed.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/buzipojuvatomenilusumo.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zesogama.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/78631741898.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b4322a1fafc10f9bef7096daa91cb9cb/35205305668.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/garabibotorekowagimel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7e4ea6c0---71387642733.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161204e51ad5d1---norajurulasug.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/08qgrqbtqdar37usjncrb6bver/gesogukotawa.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kovaxoxosulavikirifoti.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pitapuxatojadafatafikifo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/90j7nc7ek9ds8u4l5lldmdu5c7/17224299728.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/56620410169.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/91616923398.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/55263293488.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/91936842586.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210816020116.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/rajakawatorumisexeris.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b830424007e---nadifekowobogojafadozew.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c9e36c6225b5fef331f565ab10249800/38253507179.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85bee2203a---ladivabodevodegu.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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 10512 bytes
SHA-256: 90c3f9e3b6606ad2c1b8c1f83091d7a1fd1315a2a0af137b2a8215c48e50a408
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 19240 bytes
SHA-256: f865484f40b079b9defe34e7b16c04b0d21eaf3e9f410901e5792e31a0de1fc8

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