Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b2ef5438058c6a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 02:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd55fa91006633240c3f8a8e4856eef1 SHA-1: 8c934580e2cbe0a71cb9559219308711de51d460 SHA-256: 44b2ef5438058c6a44c74432a8993ff6c7211e64081c069293796405dc079ab8
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. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=best+android+contact+manager', likely serve as lures to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=best+android+contact+manager PDF link annotation
    • http://chataphan.com/file_media/file_image/file/pigigewipuf.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9d282c50ef432951b767b81d5eff4047/66659973965.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/tazuta.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/naxujiru.pdfIn PDF document text
    • https://shunnasato.com/sazizesusetemot.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161434afaca6c5---74891249375.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/veribijadirif.pdfIn PDF document text
    • https://redac.ch/upload/50238379017.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/20815156965.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/df7m8ljj5fic7cirmr3h61hul6/21193623286.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/dugalupeb.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456235beb41---kifulevunaderu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/56723925347.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1a0458f8a37284942f9843d28a9cf0d9/rogixibudobenuka.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/zimupefujepobafune.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/48594996085.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/mekam.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/fevuxesoxagabolataf.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/tasupixubukuguramuxegul.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/vikexiw.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/melukafavidi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/63006895540.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/nirojiwazuletumezu.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/vedidizurowatedogesid.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/84992921460.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/vuvepiwavubepuvupe.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_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16908 bytes
SHA-256: 83b18de7e5000a4f2af14e6a7e2d9ef57c2233ab8e85437592a0ad42848e1b41
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10720 bytes
SHA-256: 01baac2b8a3a6aa4ef63c83993c5735274b37b41a10b098bf9909988eca1e039
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1