Malicious PDF — malware analysis report

Static analysis result for SHA-256 037d5955e02cb942…

MALICIOUS

PDF

102.8 KB Created: 2021-07-02 10:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bafdd0f35111391ac9b537c8e866e7fc SHA-1: fa52317dfc3a4fb103a959cb881665a1b2b1a6fe SHA-256: 037d5955e02cb9428dc08411e7df426cd4ab49a9630cb24e75b04d8c74c63702
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q0i7q3dpmbdkg9n5kd93odo1n8/47458858311.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b7b5ef43760c9b09d8bf06f98e2b61f9/sosinedijunonoda.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/75be483899dfbb64843ee9173cc421cc/rigavosiwumojasorid.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t2ulgf424dv79k3nkp6bki0bl6/jovogaxugalozefonedibuz.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/1380270121.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/6112106541.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ac263b94---rabulunuvifudaveliwoz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238353ad36---jijunubivawe.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8c78db9567a3021edb4a5d6c3e51d0d5/31824734430.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6lgajuvla3uldjetvo6c0jlkvs/sawinorowepedavole.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18280039719.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608d440b1bd39---gidutizubuloj.pdfIn PDF document text
    • http://sns.hu/_user/file/puliminukimobuwot.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zipafatezalojawinuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7ef824f9---19431414956.pdfIn PDF document text
    • http://euro-ex.com/85529990698.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4c1tbrvdokfrd3e5spc9nqq75v/fajemowafoluwovamivi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1031ffb210eb0271d60f749923cf7fb9/bomanileronimu.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/37706671611.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e2cd3d3f75bc202bcdde7c00fd509b3f/komugegige.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c444dab2c6f---masiravawosov.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/agobotolumisaze.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1e669f01---27503814711.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165ea865bd---83769860261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=surface+pro+x+manualPDF 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_off00012efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFA 10560 bytes
SHA-256: 71c272e56433aa7dafe9d338743fd6b3599dc554bc7e53a91a4b133fbbcfdc02
font_01_sfnt_off00014710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F22 17328 bytes
SHA-256: cebb90257ad70605b3d9dd00b20ca7a7d9f53980dd5742dfd5398359cddcab18

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