Malicious PDF — malware analysis report

Static analysis result for SHA-256 603afbb68694d73c…

MALICIOUS

PDF

98.2 KB Created: 2021-08-09 01:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5789a6af2997d06c6509c1369152b331 SHA-1: 9d4a125d7f5e27e4167cbc721b3f89ae97ee0e20 SHA-256: 603afbb68694d73c423a223df3d9217696ccdbeab4a1badd54e4b3383e6150ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially inflate search engine rankings or distribute malicious content through a network of low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=how+to+ascend+ark+command PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///vinudodu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/60272177909.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/32174461833.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607036a57763b---kiwimada.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/28718245395.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/81339113256.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/dedokegexegewup.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/54731673956.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/12363668690.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/13814800132.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8556e91c051132a8f3f6791defa0930a/74671756495.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a9eba97a---88013150492.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a3979id5hb3kaj9mj4ik603956/xotus.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/51065576147.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/87221885896.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/68a880e62cfa9a450fb675b3052b2bf7/dodibenakub.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64bc748c2---bumatakizulofewopipinu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/61603008070.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608729729f619---powikuk.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607df15e83d84---11589757248.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f31e0304a---zabodaguliwoligime.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d13a0128---86155841572.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8047d3996---52134306139.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/67337479034.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_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 22632 bytes
SHA-256: ff6646a5c2915f59a10e7e3168941e642fea90bd068cf05a6786995bacdd338a
font_01_sfnt_off00014b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B19 10560 bytes
SHA-256: f318aac3e663d5f661c1dc4b2cdb32a920b6a2bb2fb5e6a3378ed4f26396efbe
font_02_sfnt_off0001633f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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