Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a43a5bc5c5b689…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 19:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaaf80c1318d94690cf1135bdc1cdadb SHA-1: 7e171781a63126d1a627f91303e69b29208538f2 SHA-256: c6a43a5bc5c5b68952da3a5915de4bd801755244b30b7bbc0128082e816e8a5d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pikc83ji0r40b1bmmmf236n1bd/91854799878.pdf
    • http://thedreams.cz/files/lirojotisuda.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/98539373863.pdf
    • http://cuatro-pr.org/sites/default/files/file/nusomezazegirovonenedi.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074701d1ce73---wirulezerogu.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf322c2bc8---70087700854.pdf
    • http://dokumsuzgec.com/userfiles/files/2888178394.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a465ded1f86---jowulifipusosanejul.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b34fb7f06184dba6cfbf335c44dd8a4a/mawusada.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0vh4dlsmbghjss2svtdfdm5jcf/vomuxumugotanolaj.pdf
    • https://33mobility.net/uploads/files/gaverupuxujatinovuzamum.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e82a785acd1c0680bd4602b4cdf94b74/sinuxogoba.pdf
    • http://myphamasia.net/upload/files/nuterolawawopaz.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9c84b64e73f6078cdf5bdb1b34276905/nirosumo.pdf
    • http://ecohort.com/userfiles/files/419781378.pdf
    • http://mini-garden.ru/userfiles/file/nikabemumofiniv.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/zafizinadix.pdf
    • http://jjmcp.jp/userfiles/Image/file/puravu.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/1d9q0qnb3degnoq1i11pqu69vu/fusegemasag.pdf
    • http://www.anclupnapoli.it/userfiles/file/51434262003.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607287d257970---92994352789.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160828b4da43ee---wefusafavatupab.pdf
    • http://twothirdsmajority.us/clients/38522/File/34885397190.pdf
    • http://skpizzasubs.com/uploads/files/49243299831.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160786e553c9f5---lavuguxojisowapatiso.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160788758980ed---bapud.pdf
    • http://stphilomenaonline.org/userfiles/file/31779322753.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=devotional+for+young+adults+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_off0000f5e2.bin
4a58aec877a759e0a4cffceb23459de71c7d20afa44f100a65705c157ace678a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10952 bytes
font_01_sfnt_off00010f37.bin
65844de0bec39f660bb554919737f885d28c306dd556938119b27048a5da27db
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 17552 bytes
font_02_sfnt_off00013d15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D15 16792 bytes