Malicious PDF — malware analysis report

Static analysis result for SHA-256 feff3206a522e203…

MALICIOUS

PDF

106.6 KB Created: 2021-07-18 13:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98c48f7b5fc87bfeda419a9331162188 SHA-1: f37c6a4ffc21f1ec6a7b650e72fd6a95d7f19dc7 SHA-256: feff3206a522e2032837d9fec97309bc599a03711dc357f77855e2015aba9043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://alhouti.com/userfiles/file/telekubaze.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bce30678---jokufejagogox.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160739434d193e---ruwirerexaf.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/83340788436.pdfIn PDF document text
    • https://ksuskalology.com/images/file/deloviru.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/07g0n3039310ptaiplto5qessm/55396795041.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/bipusasinibemekub.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2une7q61e130ko43ssk2cpi4cd/tajibuxevutaduleno.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e0b1547c0---1572541927.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b26921f8e---vibariv.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mebaz.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/23542228532.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716aeb3da22---nolawipewunagu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160947cc149c30---11278534938.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3133e266ae---1700756107.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/42815611033.pdfIn PDF document text
    • http://effektfilm.de/files/file/60405150711.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/te0ptous27pdidvn95gg810r0f/weputimuxutoxemubezer.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qi71o7ictr8aptoi4j45smpqa0/piranopabejesikimade.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a504270b249d13466b2eaa281a620f7d/fevovamox.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d6010d8e---salewegebimaw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08e323abb---3204068449.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/vasakudenenaretila.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/fisakereralagusipavajube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=springs+english+textbook+for+class+12+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://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_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF2 11480 bytes
SHA-256: 322c7a9832c950d08271fe64efc904b96975930d15e95b5a47c2fdd1e6f62b6b
font_02_sfnt_off000175ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AB 17448 bytes
SHA-256: dfab2acabc3b9dbcedc94729f4543a68a532b293d32be9abc868eec39b596780