Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f4a8d7241157f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 23:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0d472096d913d707912c25ee5fb8001 SHA-1: b67a6b2fb7b178c3444d5752dd5fe414d89b64ab SHA-256: 638f4a8d7241157f54e2660129b25ad51b32b1066dcccd44a3ed44cb34f33bec
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=noun+worksheets+with+answers+for+grade+4 PDF link annotation
    • http://babijie.com/upload_fck/file/2021-8-29/20210829035531620742.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec981ad9678---bazokikubibagobojomat.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51a634357---daxafaz.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/worop.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a1aee875---9311197701.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210803214718.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd8e4cad2---zeletelukevix.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/02d55f86bc5d27194768bce4052383df/53058056500.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/00a268aa301e33a866c0b164c336bdd1/jopomi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/rirol.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7663f3758---nebizilegufemidawugaxexet.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/simaxofuxanozi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/18621984075.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/zifekej.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588a77733d---23248684589.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa35ba90f2---14903568801.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4076506ee7c01d903ed5e277a87211a3/41145095137.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73300500f2---nafujijefitivatisuj.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/79572582547.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lizezinajufuwidupojovaxog.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/68336021670.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3443e7858---ropexufim.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097774f22f94---7962698950.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/58302434287.pdfIn PDF document text
    • 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10920 bytes
SHA-256: c5dca387f52b3b98ae5d4ceb2b8bffb9e6cb70b3fcfb3399273efd65fe5433f7
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 17824 bytes
SHA-256: 95215eed1439bea69b0025859af9005238c70544e5d9d55ca0188d7564b09aab
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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