Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b43a5bde4ec630…

MALICIOUS

PDF

78.7 KB Created: 2021-07-30 13:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 17975787426db6aba16672f40584f802 SHA-1: 582ca040216e75a37c61602e521ab768f8c585c4 SHA-256: 74b43a5bde4ec63041696c600ce9742125891fab2d1e7f3b71387288743abfd2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, many of which are hosted on what appear to be compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec9be2161---77076500433.pdf In PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/zurebawemadedapijoxuvudu.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/15259322503.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df78a4d903---mipavoz.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce85bee1bc---44600619322.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082a07a4d684---56385484593.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/529589511.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210703043320_537171.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/bazizasonaxoposotaxu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/10d98758252abe3e4f373b40c4de8747/xonevoxomamawikax.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/nusizofojelazifoda.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/bitibafavesuwodebilejizi.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/47289784933.pdfIn PDF document text
    • https://pcetravel.com/files/file/26018381166.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/81427223929.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/52469101301.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8dcef746bfbad6e1401400276b3520e9/74404315377.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/dejopitexonul.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30da8a99d3---xesuti.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e350b32e37c681fe1e8d8210d464c30f/19941094282.pdfIn PDF document text
    • http://araonline.hu/uploads/file/volebagonimipexegoxiw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e884463d9---95756727715.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1ieabp67pccsak06hhumhujlrm/sodalinojex.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/gubarusolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dish+codes+for+element+tvPDF 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://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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 16256 bytes
SHA-256: dd3f775f7faa2188878952687ced85ecfd48c8a5809ab8f701bc6f253cdf02fb
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 10644 bytes
SHA-256: ed896f1ce5ddf110847852db4e6749d4c388f84dfc0835bcd90364c9de2e07c8
font_02_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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