Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d26d685826fedf…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 01:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df69dbd343e3d0db3f139efc34e76907 SHA-1: f4e5fefb100270036ceb7e8cf197702ae1aa0c91 SHA-256: 79d26d685826fedf82d4b721d311bfcb75fde82d043e632b1d15438ce041349c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a link farm designed to redirect users, with one URL specifically mentioning a 'screw size guide pdf' which is likely a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=screw+size+guide+pdf PDF link annotation
    • http://lactopad.com/uploads/files/66489149937.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e4fa91342b676be881972ed58d8246b0/93337905698.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///pumubikezuwelok.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/nuzobolojizijinegofupekij.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/53388a25d110d3d18172b06906533c60/79795028967.pdfIn PDF document text
    • http://skia22.ru/pic/file/26784564610.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28734082315.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/49b65caab9ac61003b3bf95625523bd0/noziga.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/76365167179.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/nuwakiladejozudujojosod.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad50f39479---99563072824.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80483447367.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/65125616664.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/15553579927.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/83205789969.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/rojepudo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4874dffe---tisusibo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/vigumosofuzowobuxowu.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/40036028660.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/nikapawomef.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3433a435d3---tofozufexisiviti.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-6/20210806105345341519.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/57085097304.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/jujalufixesosugibowij.pdfIn PDF document text
    • 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 10584 bytes
SHA-256: 16764ac0c36fe07626192ac8c5a3ad511170ce0378e15d64cc095b90241bf850
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 18412 bytes
SHA-256: 4ccb23e05b3b1b9b9c25c2050d9f21751202d24e96f491e9f93a0ba8b65b0e19
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.