Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a81638e4dcea0a3…

MALICIOUS

PDF

131.6 KB Created: 2021-10-15 00:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eda98e9154e3ad5edb781ed130bee078 SHA-1: 1d7544c952406ccf14e43fdad7d92266e434bbe9 SHA-256: 5a81638e4dcea0a3160118387789e32f0ee061186665ba6e91671432dc211030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://go2germany.ru/files/file/75074458510.pdf In PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zolalopetomu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/32542370606.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/niratedu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/rewadunobemokanokuko.pdfIn PDF document text
    • http://snft.ro/media/file/xefidunonip.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/71003652443.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/wumopegefa.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/gimim.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16163cc270a74e---56527842220.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/d6mo3veefuhb8phddfdpjje1ut/sigibopefufejupi.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/72433636333.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0a7ddc25---815588724.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/difuxuzixawuzewamuj.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/56738922500.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/68656165065.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb470220cc---dupikaku.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/87371537562.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mekikaxidabujawojam.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/roxipa.pdfIn PDF document text
    • https://airxps.com/userfiles/files/31464463381.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/revurutupifom.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/35808244486.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210905_052248_147.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=bsc+physician+assistantPDF 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_off0001940c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1940C 25208 bytes
SHA-256: 74a685ada9666eefeae6611ca5c7ea3ecea56345cc6fdbd3619f9a9a305970e7
font_01_sfnt_off0001d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1B3 10240 bytes
SHA-256: ec21c15ca998931f8f8e7061f3220e252a46e891611113d57c7ece68934d0e5b
font_02_sfnt_off0001e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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