Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a28da4ace801a5…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 22:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 128cbf3c9ed104ee1e5f4c6239c32ec8 SHA-1: df3a2032aa9840e7767f4bbba4249b3cbca7ad84 SHA-256: 05a28da4ace801a5cc9ec437c4f668c75757bb36813530696172c69f8d2b905a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=nerve+pain+from+buttocks+to+foot
    • https://airbays.com/userfiles/file/53878546399.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/5262158141.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160816026b1fe1---muzotu.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee4880d68---rakesibikasedujosevori.pdf
    • http://novichiha.ru/pic/file/58081926868.pdf
    • http://cy2hand.com/userfiles/niverinalozasiberofozu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69f5c14f---57586273149.pdf
    • https://angelsstaff.com/uploads/file/75442667713.pdf
    • http://ngor2-3.com/file_media/file_image/file/87605701046.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f32b740755695d509832032aef6b4abb/rifipubunikoreguji.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9581073c44ed7f62e355d748970449f9/11035903618.pdf
    • https://floridainvestment.cz/files/file/25454099594.pdf
    • http://poslovniimenik.net/firme_data/files/27105741858.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/snba3lc1i4g5khn72is3t79p85/fijironikutalekorezovul.pdf
    • https://etonbio.com/newsLetters/images/file/72489176850.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdm2r9vnbmnh2uku7hojha188b/gaxalesokore.pdf
    • http://tortsurprise.ru/upload/redactor/files/88302386383.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d64b648f---ritovar.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de44db8e75---kivugivarupijuxukefugudu.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58a36e3f0---luzokuja.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160842694d3ada---40359393900.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qi9tq0d7aij6sd23d1gajps0h5/gajudawipakagogub.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/23550fc1ac58044712f714d4cdb2b709/wimanodabixuma.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abe143c4978---544545160.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f34e8fb273eda45776d5b5f997b6ef03/jajujipenum.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/438600cf22e82303f56b56290102bb67/37229781687.pdf
    • http://alliusie.com/userfiles/file/wezapasefejetixuzerox.pdf
    • 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_off0000e150.bin
78463807fa656abaf05d397635c8211e2369465233859eae6c2f5de869233170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 16792 bytes
font_01_sfnt_off00010c37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 16792 bytes
font_02_sfnt_off0001244e.bin
a657235c89c2d4eaf26783989d26353790a4085d56cf114359d680371a89f44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 10968 bytes

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