Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f38bfd88dcd1d3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 20:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7905665ca1e149e685fe7bd08ebeb04 SHA-1: cef929ee03aa0c2550b53237c61f579ecfe9666b SHA-256: 97f38bfd88dcd1d3dbbe83bfa5aeaa6a585d5edc47e28993c893cb965fd41dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of external URIs and link farm heuristics suggests a redirection-based attack. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=jabra+headset+bluetooth+manual PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0gge4cp5j1bv644d9t7ig5i4j/25219206435.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/govosejunepezikixu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/pemezilisurufo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c3e08348d34e9cb95aeafb5ee189b32e/43155537864.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe85463f9---zuvizijanafawubip.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gusukewikuvupajawo.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/nevofekarezoxozasipat.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/2153298225.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/55919738995.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/94604911123.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/72167150999.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/67087641480.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/3107999029.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/wixajeludilogabasotelo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sepadet.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/90761478821.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/84984187015.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4cef06dd556f80a875c719651577b41b/finowojekibuput.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/18506289636.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/lodobejivelamenizokemez.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/71231715974.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kazonofafuwenixij.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/89844644777.pdfIn PDF document text
    • http://mfahk.com/upload/files/fezesokaxoxa.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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 10652 bytes
SHA-256: 70cec1b4e7048060703e5929ce074b686fdc7850db3d883526a14e265cf1ffeb
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 18064 bytes
SHA-256: a8f1209a2ff2e5b0fc363fe4abe0ce5ad10643f7a840651ae6c79cbed15cee7f
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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