Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d7fa1a5281021b…

MALICIOUS

PDF

83.5 KB Created: 2021-07-04 13:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8428b4de95f1e4cff1c3e98ba5421397 SHA-1: ef5f753521d498ec998bd40fd07d168bf0faad82 SHA-256: b6d7fa1a5281021b4fd233fc40190a82834c0daf53645d268747232cce6ca18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/97e2e96b18bb1407cdb85e29b663220f/zizalosijixolaxagerun.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/n3heroafoflggaa7vtq5ovo7gq/34847304131.pdf
    • http://jfkanacon.org/data/userfiles/files/detaxazuwabixevorofojifu.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/eaf11fcd875b66cb8ab50d8ffdb78129/80900527042.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870ae661fc6---pokokuvex.pdf
    • https://minlinart.com/archive/upload/files/voxamezidil.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2f82ecaa9e173496344378f318cfdbce/54481434382.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7554d7ad5---91249873186.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jotavurijezerujofukuninof.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c10b34cad---33079321831.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/5297936277.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3eafc468598d4e4dec5ea10f0d73011/bejitufugufuno.pdf
    • http://ambvet-trefontane.eu/userfiles/files/38402715620.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a54ee403f38ff756554bcf07f064a37c/vijarabuxeded.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ae6e207ae75585d23074fd6309a02230/77118285294.pdf
    • http://cuboni.com/uploadfile/hong202106071019203901.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/71420359c3c8c613ac450aa02a95bcf5/wenelewerelo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fbb2861f---40115912446.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/84813091334.pdf
    • https://mttrasportisrl.it/dati/upload/file/vironutanapixanaduvo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a03bc21df---daranasakibajoxebo.pdf
    • http://ottotech.center/userfiles/file/redafuzizijufevesefo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=12+newton+meters+to+foot+pounds
    • 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_off0000e3c9.bin
61b7f283b069c3353b094211750afa848fcd643f88c6c18be4e8fc42f809b562
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 10620 bytes
font_01_sfnt_off0000fc34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 16792 bytes
font_02_sfnt_off00011446.bin
1c335ade7fde06cc55b9a30fa12d275dccb695a8907488641f3553708e90d094
pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 16992 bytes