Malicious PDF — malware analysis report

Static analysis result for SHA-256 809a44f29e11886a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 07:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a65d3b7a34837c302f060b8e8fa064b SHA-1: 5e68cd61e451f9f1cab4048c03bc5ba1c988408e SHA-256: 809a44f29e11886a7c7d0e852e083f0c5cbd65548ceffcae6f784f4bd8af9fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bmat.mn/uploads/ckfinder/files/watuvikesox.pdf In PDF document text
    • http://cuoredicane.it/userfiles/files/datamatuboxudoboxubajajo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c86070664ef5b2ab68bb9f113ba5438/wuwevuxefibun.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/lanuvirisalelevulap.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/68145968559.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/xefisejutawelotepoba.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/40413763101.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/purelari.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0c426dbf1637a9012dd590370927591e/dedovulazided.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6fab8017c---majifuzorunamozinixevodi.pdfIn PDF document text
    • http://risme.vn/files/jenikozovominokososutebe.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/togowumigojak.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/newenamukobake.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/bazenurupakofafafa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8f755c918d1c9f91923b443edd36644f/rolivemugatekezokap.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/53674966814.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/34b90c286a788179fe7b21c1d7f04558/1841477940.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xudivukajemuxukodeli.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tedobajux.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/71963299298.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/88744871728.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/566aacb435e739264d4948b6e5fc4571/70397858349.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/eba2f8b7c45bf791098a494e148ddbdb/kalavewetepokidugotegeno.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/77838344772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=monopoly+game+free+download+iosPDF 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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 10936 bytes
SHA-256: 20611ae5da0849defa83ca7b14642d7ef9c4fe425676733c48d21d84d8f72cbb
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 17460 bytes
SHA-256: 54b15aa61e78a49a31988fb90279460f0a0a1af648586ee5b3178af2f5138a98

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