Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd7c5424abe9398…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 06:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36e07afe17d85632bf709144945e5723 SHA-1: 19d9a1fb757fa2ed15a589dcc1c0e5ddd5e1b448 SHA-256: 2cd7c5424abe9398114218ef85fe203e7ed9e15581328fd13fac4237268fdf37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/waxotusumumawujo.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tmlsulk3b0na595f6546m27l03/texabevomewaxasosizetosom.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/13272913917.pdfIn PDF document text
    • http://klefmarken.se/upload/file/sefunaxedavareb.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///guloduramitupera.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d74eba2ff1---dapanisagarij.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/jawuluvuru.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/rewedetesixinujo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b818a6a02---50397090557.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/biwokivaxosatag.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/pikafamujejodobam.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/gigixilogapojofulif.pdfIn PDF document text
    • http://contua.org/userfiles/file/dipodufegibaxex.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/fojikelij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c5a1bc5be---91664551047.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/sujomagunogagurajoti.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1950252541d0c93a4834614301c1e861/duwumoruket.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/38413258872.pdfIn PDF document text
    • https://digireg.si/upload/44343795830.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wegomosu.pdfIn PDF document text
    • http://iphysiology.ru/upload/gilalikesebalufaditol.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/jubalobumotategubi.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd3060e52---74921472642.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3cd4aksvfk2pgss7ksatborkfq/50981202512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=summa+theologica+pdf+espa%C3%B1olPDF 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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 19636 bytes
SHA-256: f914f98486f0b0bd09be9d7feea617d2e9b19544eb72d9590de92e33cea1a39f
font_02_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 11244 bytes
SHA-256: a8cff1533d76528d6e86173777b4d805cb0e58e928e0b9ddd85df502770db6fa