Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6211ba20b02223…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 16:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be1a0f6a56cbf53859f867276e19b63e SHA-1: e9eee1465e1dbe1e91aba7b8d8ca41845e5bc46e SHA-256: 4f6211ba20b02223651714557f43c519ac3b575988eecdb473005ba8660ad285
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, disguised with terms like 'gta vice city mod apk download'. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://kurashi-kyoiku.com/cms/dat/upimg/file/5100223624.pdf In PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotizoja.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/tupeguwisinonusatobupeket.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kadafosaluneti.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/42934916939.pdfIn PDF document text
    • https://suruburi.net/mm/file/29581775405.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kfh9n6vd63ffbifhl1srnmks87/mafogadekofix.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/51212108784.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/096c5c8bde7d5e6fd703f632614921ce/90186812305.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/73443622730.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/2155878810.pdfIn PDF document text
    • http://zuszdounky.cz/files/3380514936.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/46919298000.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b64ad1f98---97665910090.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/leludidikubeb.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/49311832017.pdfIn PDF document text
    • http://sung1.com/upload/files/49514284736.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nepipakuwatubet.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/87095276044.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/gemaxepuvi.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27543100639.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5e59e319---memabakilexejixetaluke.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc4a45f7b---66861620545.pdfIn PDF document text
    • http://partnercable.hu/files/wirowevogusezupasojuwibi.pdfIn PDF document text
    • https://unitjaya.com/contents/files/87979175338.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/30639585676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+vice+city+mod+apk+download+android+1PDF 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_off0000bcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBD 10956 bytes
SHA-256: 7c4c0be161aa080816ce0c928bf830d916b2c4e2bb223fa31dd67781c7046cb7
font_01_sfnt_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 16880 bytes
SHA-256: 99baadf47746068b5c0d9e1dbefc7e08b928ec21fc315be8a11a7366b8cdc193
font_02_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1