Malicious PDF — malware analysis report

Static analysis result for SHA-256 148d61ee46fb9745…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 19:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13b224fbbfaed5aa1485a6a7a32459e4 SHA-1: 840bb89cd2e82bcffac0b842cba1de6b6611f665 SHA-256: 148d61ee46fb9745ab6fd0a5ebae9b35d63c3b60efdfae6c44ae8e09fb56a8d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ilksolar.com/Images/Media/files/sofar.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v97ndgbpimq5n65gl3sjgcc6o3/someja.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/69889904983.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/wovaxadisogikiporagubup.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/kenaliza.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/2812307198.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/tixaledimezilokubizizik.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d52c354bd---tizigimuwazokosur.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/regok.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/danefateralora.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe086ee988---sebox.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/43150846865.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/15423780834.pdfIn PDF document text
    • https://digireg.cz/upload/piruluzifovone.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021616446283411.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/41106241036.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/16711841958.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba8de5fcf---82470772312.pdfIn PDF document text
    • http://fullx.net/files/wakokifigopo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/29332587366.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c582f013b57---fakunukuz.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/18922469241.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1532320418611891a7201a9.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/75631340594.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/52d936c6cdcd8ea44709465d3ac8a50b/25631356847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rockshox+monarch+plus+rc3+service+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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 18584 bytes
SHA-256: 1b462696fc82c20386c90ec88e1f074a666721a516d27ce5c39fa2863bd01855
font_01_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 11120 bytes
SHA-256: a031081072224a6edae3e1ec170c7046753741376b3bd4773a3c6603e22453eb
font_02_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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