Malicious PDF — malware analysis report

Static analysis result for SHA-256 540ddb5a5be54146…

MALICIOUS

PDF

88.2 KB Created: 2021-08-04 17:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 137277dab75383ee104e3e833f6b9d84 SHA-1: db2beb81b27476b13094fb936719e8df283326b0 SHA-256: 540ddb5a5be54146c6877514d8b574280c188747887f77a72ea276682c923862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102efb5af2e3---66382257602.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b28b65b8---23642154740.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872be3d6502---6247824839.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/womanor.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/60483761094.pdfIn PDF document text
    • http://cobmedia.hu/include/61821471085.pdfIn PDF document text
    • http://efrex.cz/files/file/77857940438.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4a419defccee697a36a7f255f05d54b5/7911431864.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zegupijegujalemagu.pdfIn PDF document text
    • https://actorconseil.com/files/file/zovor.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b683c4b9c2e68a9d8fbe258be6d7d447/19425575228.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4463275ad9e39ebab0ae7e825ff62201/57049896608.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/93712235627.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kitot.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/745633f88280a256f29d00aa93e310f1/lidusil.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085181d6364d---52995004959.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/90518961144.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/olpooumhf63u6946jp503t0h8u/bitoloxibutulamozig.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddff2b064---26831915295.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/79816753300.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/84810274230.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d84d417fb---32043413517.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/75422461342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+weave+a+paper+basket+easyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cbba352aa80df603967258973d8557c9/26233617916.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_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 17896 bytes
SHA-256: 140c079001b5668ca318c2dcc917df06cef96e4ab837f67fc8dd504bb1ed0aba
font_01_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 10492 bytes
SHA-256: fa2c8fe535231d6a9a8a80e6ce3b2848f91e7466f17ee498234cdb1a78db6cbd
font_02_sfnt_off000139ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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