Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14cd7926b13e189…

MALICIOUS

PDF

80.4 KB Created: 2021-08-13 09:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9412843d1c55b731836f773b18ce42d SHA-1: cef330f012ee55041b644ea8729c440aa4ae8b3b SHA-256: f14cd7926b13e189b91d9732e92609cc3ddc14cc86aaea6e4d42ed623469dfeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=caterpillar+3126+repair+manual PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/nh9e7jiirh5a34ki2qkbq3m846/susev.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc229c97aa---ridibes.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5fe945f1---61734082179.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/35557179038.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/fimogetufajives.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e339b766e44---99659010759.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bfb28c6370d0df8c92d8cde9310583d3/78040298048.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/86766787581.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/32639668089.pdfIn PDF document text
    • http://fotossc.pl/_files/file/50084310426.pdfIn PDF document text
    • http://irollee.com/userfiles/file/93156632085.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/zudupavura.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nozaguzajak.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/81128302202.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedac567e0---28952380672.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4ful84qtes720q681kuhuj00cr/53213831388.pdfIn PDF document text
    • http://abpaluso.com/upload/file/todawusezunagoxatazozad.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c313ed0d6---mudegipil.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/mezos.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/90281983050.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160899186ef9f4---rapegubijezo.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/gatoliwuvorobewiwixozafof.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/90614757312.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nuich7u02rktvem6gh6u4njobn/xibin.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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 10768 bytes
SHA-256: e0a5c44a74a5f3fc87f00e86f0d994d1d7e4eeb19ae301d3cdc54763da9ce8d7
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 17112 bytes
SHA-256: 9ab0f086a9ec8f0437df8f46d7b0112e98381bd057459faefbd3bb17605629b9
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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