Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c8aa424d1ef9d0…

MALICIOUS

PDF

85.0 KB Created: 2021-07-30 02:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f85299f033cbb5673c270e24b3a718fa SHA-1: eb3cb0b14f7398f74a529608e3d88a150056f026 SHA-256: 76c8aa424d1ef9d075f482986e15f9c225437267249d358fbe3ff2816f1a38d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, likely intended to trick users into downloading further malicious content. The presence of multiple unknown URLs associated with compromised CMS uploads supports this phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483498617f---79192441772.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607728160f26c---39257342763.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zavupolemizesa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h66huuim3rhof3gg7ifkjhtq55/30488517545.pdfIn PDF document text
    • http://apvn.info/userfiles/file/4180427338.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ec6776e0---pakikarikatifapupek.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/64157912363.pdfIn PDF document text
    • https://fishboat.hr/files/72242278107.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jqob91ie1flnvrqlfplbdpscg3/54350070714.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pinanesas.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d7s20ct6tcpgf1jhkkpvlhan3m/46856549877.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/bapejazititokufigi.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/38966906016.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/15345071069.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/xotiwizujobixuropa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c727777e916---miberax.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/kigeduxitemizorunug.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/sufeka.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/24542933892.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22857717953.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/pajobewofa.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/88174218204.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/o1ip7pltlnghklc8j2o7650rl6/tutobotunamuzeg.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/82200771335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lumiscope+advanced+wrist+blood+pressure+monitor+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_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 18444 bytes
SHA-256: adaa53caa5a3126e6d0f5f04eb8950d1120f00f995549a139ee89f63b8be4a1c
font_02_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 11024 bytes
SHA-256: 1bac9c71df413990474958b00d0f260f60fc264c0e54630534e29f3c3b31f231