Malicious PDF — malware analysis report

Static analysis result for SHA-256 44420b01f98e31da…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 14:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73926b0a708b409c4fcd218ade67ba48 SHA-1: a7a3ab747b18d220be5a6fc1cb5ebaf84dba313f SHA-256: 44420b01f98e31da7c9927aad5b61038c82d2071c3b219ba8c403aad434ea4d3
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing. The presence of numerous external URIs and a 'link farm' heuristic suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6f21602a---kakutazosegemokufigowo.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c727b725---rulowapezabudasudepa.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/fofuwasoze.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/65714281960.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/1801496450.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/gatepuzuzazemigumodadiroz.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/27297861281.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021082921165073499.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/mozusawafumeside.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sjaog3q188vqsu53440pgc5ce0/ligutafijabid.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/bonejokadutadagirijut.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cbac0e6f061d4d0eb2ec67d8b0bd3088/lupotagonopuragifexoso.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5307d73b65---94379337456.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7013186726135f4667e43a44ed46edc7/tubixenomereribaragada.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/45899074686.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/wezuneturogojob.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/pokaxigesujedados.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160df124455820---pidixowuwekisugudiguf.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf6736040---99971792675.pdfIn PDF document text
    • https://yellowstonewildlife.com/39748477331.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e47c79155---65653890560.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/72600294628.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eeba9c248---rujutebudamimuvef.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbed505cfb1---sewibiriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spoken+english+books+pdf+free+downloadPDF 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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 11072 bytes
SHA-256: 73fb2d6f4e6e3974979e74b4d633e724bf3c338fbdedd9d7dda9a7e222f19ba6
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 18592 bytes
SHA-256: ef0faa4dc549dc3e80c5708e89602b204c7deb63a6dea0c565daa7b7610a4c6c
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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