Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9af1ff81312bbf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 23:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54ae2490a1d4e0f85c28e6da1f5933fd SHA-1: be2e94a6eab3e4e193c8e0f209e389122b36ac9b SHA-256: 7b9af1ff81312bbf02a882c6bbb7ba60d8f77420d5ea0eb9a0a5f2ab68803f5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://parkettworld.com/upload/files/ladegekavajikemaximilew.pdf In PDF document text
    • http://ilkconstruction.com/Images/Media/files/93042831058.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/72472827778.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/61913091693.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/5274353687.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134777babd02---95756136367.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/zovapolajes.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/71210494297.pdfIn PDF document text
    • https://quizai.com/uploads/files/xilagupuxejafasug.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b95155361---ludenekakotawetotufiva.pdfIn PDF document text
    • https://blv.by/upload/editor/files/44808552072.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/xotasuxet.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gbonc7dbtvi1qrit2i1hvbikc4/20297094686.pdfIn PDF document text
    • http://sdds.be/userfiles/file/548409710.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/negelejitedos.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/tegimapuforava.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/20977450571.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/womesago.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/38714493328.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/leropajeso.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/kofedivixoro.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/65071430563.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/18835478272.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0940f22b9---2584156537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=viktor+frankl%27s+man%27s+search+for+meaning+pdfPDF 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 18648 bytes
SHA-256: f58b09fd6492fab7aadaabd1308b11d7397ec7b7107e6b60f57c1e7e7c53d83b
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 11160 bytes
SHA-256: 179b37ba1c831f17971e04b42f214c3449be9b4f239c014564140316d9b0841d

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