Malicious PDF — malware analysis report

Static analysis result for SHA-256 5975e1000e969dd9…

MALICIOUS

PDF

100.7 KB Created: 2021-07-01 11:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bc7109c6643cf4eea0afcd746034d3f SHA-1: 237d313825ab26c94742cc33cf49f99403a36014 SHA-256: 5975e1000e969dd9567b909ee75c2bc3ee770556046a98c7480c4aba0cbb24de
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://servmed.net/userfiles/file/wuxofuxejifonibebaderusal.pdf
    • http://www.aadhar-interior.com/userfiles/file/57262549275.pdf
    • http://eros-arena.de/eros/userfiles/file/vurotenorovom.pdf
    • http://www.odnpoznan.pl/fotki/file/file/polawedusovu.pdf
    • https://big-affaires.com/img/pics/files/bunulirawavugupepomabixon.pdf
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/26395119497.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd823571fb7---29395354819.pdf
    • http://m3hotels.com/userfiles/file/64959924799.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/44bfe1fa87b6f706b456264ae5042dd8/judatevufonumilavoviz.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3440037566b4df10160f19b928ea6a45/ribumitavikof.pdf
    • http://assushop.com/userfiles/assushop.com/file/sanegozimonimisegatenigak.pdf
    • http://fipjp.com/userfiles/file/65382567792.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/63109409935.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed4f77cc63---pajabetepebujo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090d8ff6d374---12464113096.pdf
    • http://xiaohecollege.com/d/files/82279083543.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e3b44e334316acbee78857146178d031/66533996347.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b13f839f4f0---84905365083.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a9fe4ac283466bbfd4f4d7646e9af825/5679573693.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c371deece4b46f29aaf0994b6e5bc472/murod.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d551a75da---57847970282.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ci7tq7pon5dqi10dfgmr30abfl/63330254929.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=listening+meaning+in+marathi
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f2.bin
721185091fc05b5a488a0d545e78acdb36e314b7ab4301d1d73a6d36ec524fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 10344 bytes
font_01_sfnt_off00010a16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 16792 bytes
font_02_sfnt_off00012223.bin
9d4141ef5991acd2b94b6c0b5668c5858ada0be990fd583870782e61b943e83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 2052 bytes
font_03_sfnt_off00012b7d.bin
12506a670896d7af95dc507a68505affd777bddb979fe503c215a47fd848cbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 18396 bytes
font_04_sfnt_off00014921.bin
0ba1a98283bd5d52e27b63d96f7c20ea621182ad13889c9b24ef11415274462d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14921 24212 bytes

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