Malicious PDF — malware analysis report

Static analysis result for SHA-256 1047a28a10cd10da…

MALICIOUS

PDF

86.5 KB Created: 2021-08-29 22:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03c74a1f47f330fc7fda66cd99cd48e5 SHA-1: a68bc7d07eb4a792af8a6f95c4c25c59560340ed SHA-256: 1047a28a10cd10da4ba240b4e5ae74366c21b2d39004a4a2c7dd9b013ef90198
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=fossil+fuels+are+essential+for+producing+electricity
    • http://originalbau.hu/imagesfiles/filin.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/u4kcho2vp4r73bjmuvsjkrtnk3/94213411957.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/af07dbfd3aef09cacfc449a746bce2e4/80338682140.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/c21c2f401ee1a793b7da990f2318d9b5/kaxeweropodapojajufupeza.pdf
    • http://j-club.eu/userfiles/file/vozukonaroto.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c701e5b9a4---bagomolavoj.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210615115629.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mh6b0hicm48p3nb95nhq0udnen/losuxisitarunawajutavefu.pdf
    • http://doradcyprawni.com/images/pliki/kiliziduvenifigiwivu.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/30917278393.pdf
    • http://firanywiktoria.pl/uploads/editor/file/9051223897.pdf
    • http://www.gonouvellezelande.com/files/10520275713.pdf
    • http://kulturazebrak.cz/userfiles/kumowigevezapiwazajux.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/berabizupofimidetum.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kll1q6er9hccjqlb8sbhtufg7f/wolipagebu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa459d277c---14761399941.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/822b750565b9c01889616d24c1f7ba55/66565241971.pdf
    • https://spotiverify.com/ci/userfiles/files/xuzesewuzimawasiwasibik.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/cdl6aefurvl78kngd61tkvop1i/zasipupej.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4d77f362a8---26091712770.pdf
    • http://ozari-ua.com/files/file/parumokezukifijaj.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/vufate.pdf
    • http://biswasi.com/userfiles/files/jajezivom.pdf
    • 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_off0000ecb8.bin
8ad81a99162b3c12b43411e15571fe2d0b5120210f824a40037feb7b61642598
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10984 bytes
font_01_sfnt_off00010626.bin
7940fcd271068e2c7cae4b6f995fca22fa92da17d099ebb42b1c7f20df4979ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 17616 bytes
font_02_sfnt_off000133cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 16792 bytes