Malicious PDF — malware analysis report

Static analysis result for SHA-256 178920975aac229b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-08 01:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c1ee48b2ba0000de026ba3f80a5f118 SHA-1: d3f15219624cde2ad8ada0096895527b687f6026 SHA-256: 178920975aac229b13317bd3bb77ae65c99cb8f9c5b3b5d434a7715c2372801c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of external URI heuristics and link farm detection rules strongly suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=baked+quiche+no+crust
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11fe7dc533---44707928773.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181549b4fa---pobor.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/mojipukizawanewizuz.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/fedanejurolafinejiz.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/79e37e8514709bf0e3f968caa7866069/97536689277.pdf
    • http://lblussana.it/images/file/domejirowuwunelof.pdf
    • http://accessprecision.com/userfiles/file/vibiwuzevuzivelakifinubo.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a745b62754---23994534923.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a81697b8a5a---bigoduranemanedojodagosid.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3bd14db---21131741435.pdf
    • http://classicalgardenfountains.com/uplds/file/worizidifofofapi.pdf
    • http://agnieszkapawlik.com/userfiles/file/37827351390.pdf
    • http://akcjonariusz.com/UserFiles/file/86949666741.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/05qmgtuufkf8f4s5kipcu4fuuo/vudesijenowonixupujopojix.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c94d02920---gewil.pdf
    • http://chalappuram.com/userfiles/file/sefokokuritili.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24949ad66---64664932923.pdf
    • http://beulahcooleycollection.com/clients/870349/File/terajatavobasiten.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3cc063cf---biwofotubaralawi.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a832e12b---rezogefalewunaligo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffc5f7b269---pejof.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077206b6fefb---gerenoxadiwoxerumoguk.pdf
    • http://elsekmont.eu/userfiles/file/10266447338.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_off0000ef84.bin
6f79c681e69a38fcbcce1d6871b5c4af4b2f8541b54efc820318d3afb09e1fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 10812 bytes
font_01_sfnt_off00010834.bin
9a53ebc8daafb740e496ef972b4a4bbfe5ee11beb0d18544b6075ce29fb24180
pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 17432 bytes
font_02_sfnt_off00013600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16792 bytes