Malicious PDF — malware analysis report

Static analysis result for SHA-256 781398832b5d2838…

MALICIOUS

PDF

90.1 KB Created: 2021-09-15 18:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05d3cc6a9bf3b74452073df309b3fdd0 SHA-1: b80e167407a2765645ecb074c9b6a866b6bd3600 SHA-256: 781398832b5d2838c142ba38200450e50c9bf44ce484a45c2a9d636c1153cbf3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These URLs are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://blfimmobiliare.com/userfiles/files/87573590441.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/befemilovijevo.pdf
    • https://guijek.com/userfiles/file/13958912911.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/86124935971.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b9bc67bf---fubudaxur.pdf
    • http://tranhdaquydep.vn/upload/files/12026017165.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/xaporofituzaxedorujuzer.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/vuzisug.pdf
    • http://nenkin-t.com/upload_img/ck/files/mufipugifit.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/69761762623.pdf
    • https://houstoncoinshow.org/FCKeditor/file/68575756160.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/84938244711.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4b878c03072ae135b4fbe76dd307a004/pudud.pdf
    • http://kd-council.com/upfile/files/fiselizoxi.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7797b36f2---zozevawok.pdf
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/32560592617.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/85560733704.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/51973867074.pdf
    • https://justforjetscatering.com/userfiles/image/files/kevasanimosevir.pdf
    • https://tranthachcaodanang.com/uploads/image/files/2628747347.pdf
    • http://membranekeyboard.pl/_data/file/sagilivowenexaki.pdf
    • http://irodaszer.lukinserv.hu/file/94305925036.pdf
    • http://soles2walk.cz/data/file/vekuvogelazikojoxegu.pdf
    • http://bumsnab.ru/uploads/files/xuzarevevuxagogimi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=videoshow+enjoymobi+video+editor+%26+video+maker+inc+country
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8dd.bin
f511cf13a9a97a7124cb040e0155cdb9d0b20da670136b37ef8218480dcb8f40
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10812 bytes
font_01_sfnt_off00011195.bin
ec379c6fc2f337b4d0a1016dc08939ec329c4dcb8464ccb530c542aceb1cbc56
pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 18664 bytes
font_02_sfnt_off00014250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 16792 bytes