Malicious PDF — malware analysis report

Static analysis result for SHA-256 890ab88f2d1efecf…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 10:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71ee994827ae621897784b0167cd4087 SHA-1: c3253930c4258d00a6a19621cf5373583b6e0a39 SHA-256: 890ab88f2d1efecf3de03be1d6ae1e4d9aed7ee1b39faccb81877325f27f1493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of multiple external URIs and a link farm structure strongly suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://luisacortesearchitetto.it/userfiles/files/32285245436.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/72413527972.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b132724fcdf---48049781915.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626612224395670447.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qb6sfm6p5v57hkh70toa28anjd/19487805035.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/juderibogupifupanowu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/xonefafopafitexaw.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/80722343942.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094663e8a9d1---mumogatarijezesunoziwow.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/94042983104.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/48224928324.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fofitovosejanesujogoba.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210603_0E47B6E4AB25D69A.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/dudozejodixuniwizunebet.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/87181848079.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/78576522366.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/35424361250.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/47453209755.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a151304a---34421759861.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/37995125079.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8ab5f9cdb9e07e8cf0a97a8b761f6d60/mapagimak.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/16983557164.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4855655---woxaguwuvokaxupere.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///3084153296.pdfIn PDF document text
    • http://anupbolivia.com/images/files/mogusesikuriregiduxuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hotel+housekeeping+cv+sample+pdfPDF 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_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 11216 bytes
SHA-256: 72ef96670a35b12ac2ce2218d02626fc72a782458a0bdf3b745386db6d9e45c9
font_01_sfnt_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 18368 bytes
SHA-256: e7e109b1be1899ddcbbd80fdf726fc4d0528634efe76132b5344dcd5639a2de4
font_02_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1