Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bd97f9e508eb52…

MALICIOUS

PDF

98.4 KB Created: 2021-09-07 06:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f76fc51e56653196828c3a3cdab819a3 SHA-1: 671d75cd0303b94e8b7a0d2d65b5967f383a3795 SHA-256: 31bd97f9e508eb5266dc0f186b068f87c0017d4dd66be8fa093f0cd6ada656d7
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to various domains, some of which are associated with compromised WordPress installations or disposable hosting. The presence of a raw IP address in one of the URIs further suggests a deliberate attempt to obscure the final destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://windsbs.biz/files/file/98920163097.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac216bb35---22696197044.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/54246478572.pdfIn PDF document text
    • http://villkasz.hu/editor_up/vixosukuvokamak.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb85b57a19---52072264914.pdfIn PDF document text
    • http://petrduchek.com/files/58291715895.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/pujenaxopijudozelemuwo.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/zifedinazamogivutules.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/85364165595.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b936b19a---36864514765.pdfPDF link annotation
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/13116381379.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/31887174630.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/zorijujumazavojasef.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/ripawipu.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/bufoselifawili.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210811095239.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a1166bde---dinatekufolabuga.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160caa43c5ecb6---dugixefuf.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202182694957139.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/39425537515.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/97902784996.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/42765502182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=preparation+tcf+canada+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_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 10400 bytes
SHA-256: a862ca07145762e1389ad990861849c9eece620f70d4205d28204bdc8b8e3841
font_01_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 21396 bytes
SHA-256: 1d47c43cd17bd6dbc6aabfc9c8ee2a31d55eab8fcd31be743e5ea640b97a34a4
font_02_sfnt_off000163fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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