Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b744ae5d6b7224…

MALICIOUS

PDF

98.1 KB Created: 2021-06-29 00:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 179eca42b91109d24caadd0530be08e7 SHA-1: 1f2dcea50a4b8b75d2a9259eadb59e5679217975 SHA-256: f3b744ae5d6b72248b9cd45c3f3eeafbb650e426be8360f26eb6a0cc2a539476
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/07cc752383cfc7e3a913f43c87a9cc2c/rozewarowisaviwevumizaw.pdf In PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m9mvlq6he5ai9df4c7g96vgbi5/43304439861.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4857f6e08310cc813227ff868bd33216/watonitifapomowo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e520415017---xivuxizojuzim.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/lexobekugekarolisokufa.pdfIn PDF document text
    • https://ptogel2.com/contents//files/56439783496.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a783d9fd1f---42831205301.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4n9g5h27sqhdiukuk5nbr1mq67/kukezidopodonot.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078afc56a1e5---4592609082.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/nusafetakoxadijenikuko.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96d4465ae---bilanefanegulizufanil.pdfIn PDF document text
    • http://hibertek.com/image/files/20210610_083616.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160773d2c28c0b---18211323636.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/wesuzexekemotomi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ff27b46cbb20532764b071886f91c524/kuxowif.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-18/20210518144853536541.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4kg4mfmjub4uk86jj6ipgl35s/15910058934.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/7195971168.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/96kq528prdl4c9ad86o1615qkb/6419686412.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bc57ff82---48647090777.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bh0kj436kici26hg2fkka5lkn1/69855970843.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/xirawotimoku.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd64e65d2---32525027676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lancaster+red+green+testPDF 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_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 17388 bytes
SHA-256: e644462151a5d6f795b63f832d8b4ef034756b0f8a172829195608c1486636ce
font_01_sfnt_off00014c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001642f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642F 10244 bytes
SHA-256: beb013133cfa9dff392e92b2372d401dd62c275e9d602016df21c8c22ffee768