Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72be39f1adea627…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 12:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecdd025d4035d3aac81ce2f1b579313e SHA-1: 94928c487eb6c69cd3f6247da37039c2750f3a5c SHA-256: b72be39f1adea627e45995eabf1c3e3367236b00b6f2f653ff0747944727325b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'dell+laptop+price+list+pdf+2019' in its query parameters indicates a lure to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3753271f91---15256292519.pdf In PDF document text
    • http://itkaufmann.com/images/fckimages/file/sobolevawirupokipirebuwag.pdfIn PDF document text
    • https://maviet.vn/upload/files/32700223970.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6383286af1---88836929267.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/33364697004.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/degodoguwesotazezotita.pdfIn PDF document text
    • http://dges.in/userfiles/file/80445053899.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/6885651100.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/mudizejujixobokaw.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5e4ccbf8ed0043052c30c1459048e4ed/69222001744.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/83826334517.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e83fbfb092108cc751941478fb106788/pumofiwatugumepawoni.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/wujikuvidobawov.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085731ed0774---dotonoxinalusa.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/gebebekawa.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/50711806850.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c784835163e90dc67b1e421da1c38dc/texumoriganorazixob.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/terex.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/51358541167.pdfIn PDF document text
    • http://ridendo.cz/files/file/48956148286.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/1619180470.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/903a20adde9fed11a9c75ad9e3767f6f/xeximibuwabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dell+laptop+price+list+pdf+2019PDF 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_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 17728 bytes
SHA-256: 14c118f79034bb7a75174b6c2b2fbfad01ab111ececd4071e77ebe9f36cb7868
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 10972 bytes
SHA-256: 6ae85d3d595e42497c8cf1850147c104305bf57443cfec565987c13daa89414b

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