Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73a77d783baebd0…

MALICIOUS

PDF

71.4 KB Created: 2021-07-20 17:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7c38662e9291c5860496bd5d3d16985 SHA-1: 34dd70dfdafd965abb85f3940a81a1d32012ab9c SHA-256: e73a77d783baebd00bc2761ef8420586d4c1af597430da0eeb4749dd7e4eade6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a common pattern for distributing malware or conducting phishing attacks.

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://monyetjoget.com/contents//files/lozidode.pdf In PDF document text
    • http://tele-video.ru/upload/files/xuzavidogexamiwudatiw.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b23a7cc470ef2b4b975950192dce45d3/24105264693.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607189ee68dfc---77857323349.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/18893658629.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/xexisutirimuret.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/87280594054.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fc260eddf---56606217034.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gitqc6au14hobv0udsvou56vh7/67313287947.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae163165ce---gevozob.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/12982940649.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9935bed6d---nexisafisugozuzapez.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1384d7fca2d7bbff93361641906a4692/naruba.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gitiwazix.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/gumaresuvu.pdfIn PDF document text
    • http://domplus.su/userfiles/files/patuzaliko.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/48713601870.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608463dbde7c6---momasisikofusorinosobu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a03dea82f572eb0a195e349c51bb456a/juxetolubezab.pdfIn PDF document text
    • https://stauber.lt/images/files/dakebenomonaviruxote.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8904341b---jujofinoxupu.pdfIn PDF document text
    • https://majubesar.net/contents//files/sitinopaxapororaximi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/xowodidotuleniweli.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c60706e3c97---37168344380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mankiw+chapter+13+solutionsPDF 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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 15600 bytes
SHA-256: 4c4396faf4d41040f2926b4d0b99dbdfaea400d5fb3b209b052ab6046183a465
font_01_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 10968 bytes
SHA-256: ccb47c25de464dfc0971dfcc96754742aa158838a26b63b7ada1b3c476715c48
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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