Malicious PDF — malware analysis report

Static analysis result for SHA-256 948786d3944b05b2…

MALICIOUS

PDF

81.5 KB Created: 2021-08-09 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d66028ba6a56ad83305dfa0078bf7bc SHA-1: 026544d5d4098268d2c0e16c5235415cb2c13ec8 SHA-256: 948786d3944b05b2ac7de2bb9d52469b1e3ab930dec3b4cc3955ccfaa5b19a11
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, a common technique for distributing malware or phishing content. While no scripts were extracted, the presence of numerous URLs suggests the document's primary function is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae7436fa6---18180136653.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83aa00ee2---26286362915.pdf
    • http://atut-biuro.com/uploaded/file/59195030203.pdf
    • http://test888.org/uploads/productsfiles/20210707050055_ec02c.pdf
    • http://saiprogetti.net/userfiles/files/92328193934.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099afba930a1---ledusokaxebez.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f7b5d245ebbe7bcfd21cfc2fa48cfdac/pedubenavuwepakedekute.pdf
    • http://skybuildinfraprojects.com/uploads/gaputeloserasene.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef01fd5f3d---8402939289.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ppmh5lchur2q6iarms938khrlb/xawivedevak.pdf
    • https://lesfeesdelhetre.fr/upload/files/suwinevexum.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f12074dfe08934c810aa43077d9dbc86/65753562860.pdf
    • http://bijverhoeven.nl/uploads/files/78987230881.pdf
    • https://clubesolbra.com/uploads/files/roponazifosiremoz.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27df2bbe7---jomoku.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcb94a3d5408eb4d0680b4bc7803eff2/65970956858.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b165e8298---21910134116.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c86nijdck4k4skhqmsmi18tta0/faridiwejorivozutol.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/lugezajagixudejo.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64e288eab---tofosurekexewexit.pdf
    • http://se-ty.ru/uploads/userfiles/file/77499280386.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1229f1460a7626a2698bbd7a4e71808b/kafuxugawujitezemususi.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/61a087a89aac5fa877497d4bf2a71e8e/14316255559.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ch236ikp3girp6ks6eok9bhod2/punijelamokuzemu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=algebra+2+homework+practice+workbook+edition+1+evaluate
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 16792 bytes
font_01_sfnt_off0000f0c0.bin
5dcf7cf7dcb2630b1651a1a0319702145d8e86f6523a84ddc5ec715f3d9786b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 11432 bytes
font_02_sfnt_off00010b4f.bin
dd264e1e0f596a0380ba4e79b92da1723a319e325eac0934b16b73c7578132ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 16940 bytes