Malicious PDF — malware analysis report

Static analysis result for SHA-256 8729322c611543d8…

MALICIOUS

PDF

92.7 KB Created: 2021-07-19 13:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92474c7a32a931dc284833f5c10b3dc9 SHA-1: e3e9cfee5a825274eddd9447d68336f2a70671b9 SHA-256: 8729322c611543d821eccfa187a9ad8a4eb0c3744bce137ce7aa6faa4f6ed7be
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/net926amvgfus71dsb1bmn9a6i/fuvetofeninikigasevopulis.pdf
    • http://shinies.ru/img/lib/file/fagodixetufivorijakuz.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4de18f202---80303077407.pdf
    • http://gfb.it/upload/fck/file/xiwejexike.pdf
    • https://associazionedynamica.it/uploads/file/kubuxomododopisivi.pdf
    • http://jinistudy.com/_UploadFile/Images/file/78457094763.pdf
    • http://balogmihaly.hu/UserFiles/file/62288341522.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8e7fc0a3d6a90e00369a6d73f8a52d3e/78712311038.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a168fa4pafgkq4pfvbddg3q4ci/pinebewaxidojifar.pdf
    • http://abnicum.com/files/file/7760246323.pdf
    • http://suachuaspa.com/upload/images-content/files/setisazilasamafesa.pdf
    • https://baohohoanglong.com/userfiles/file/kupaxadimuniwo.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/14d90753b48b61f1d16f40f80d2500b9/zifunezutiwunewiba.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda7f6c708---getofulitapek.pdf
    • http://jjmcp.jp/userfiles/Image/file/bizeputoliwabekusan.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019a27bdff---11585995396.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94aa25c34e---10415351860.pdf
    • http://tw-go.org/files/85917923972.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/21332435896.pdf
    • http://educasters.co/ckfinder/userfiles/files/57365462298.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/986884bc07763b001d16af7ba4516a19/zonawokewotesakewesolene.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5fef3e7b013123e64f7e33ed12cde255/worureteromu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e40a94965---41050211658.pdf
    • http://mea-travel.pl/userfiles/file/fowurujuru.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/h90ob9u3a9d729cgq8e7s1430g/zukapivezide.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=similes+about+memories
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010981.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
font_01_sfnt_off00012193.bin
ab1f7d68c62ce7644cdbb6d65c2d84fdcf7cceeafd3f11bdb18cadcb8293bae7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 17028 bytes
font_02_sfnt_off00014dec.bin
c34e19b998336813c821b47aa6837cd2dc76e2023ddab45623159f01660f6b66
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEC 10480 bytes