Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f76f663a979ed0…

MALICIOUS

PDF

94.5 KB Created: 2021-06-29 06:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f840993ad09d2a44f11c2c70824bb48 SHA-1: b444b6f3951f2630dbb3f1566b50c24b42a4d325 SHA-256: b0f76f663a979ed05317f946a84f33cfe80b23394c48051992d6990c9c1aa703
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further PDF files. This suggests a multi-stage attack, likely for phishing or distributing additional malware, with the initial PDF serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c759cd3fb2---degamoguwebugaxofedesatup.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fu8uu4a003j513ofuu3setumv6/zilememimubujagavosili.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8566f884---xaguzadojafebove.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/78989264833.pdfIn PDF document text
    • http://poorclarescork.ie/images/nuvirut.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2cv2ja7g2lku7aihkj58rb69o/36287214760.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad156f9d1a4---35083562645.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/87394574422.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210512010945.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ju8c77fjbuqclomta4eimpkiig/jasulevikilonipa.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/75acfb3b4fa01af0f657d5e920c72628/disipotuxevuxugad.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160743062b1d89---40162167277.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/907b9175fe0171791205c0baebd32acf/95526763571.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/fukaputaxadojunib.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/5297227103.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb009f958---95504157593.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/74m9ckhss09fepvbe1iqpdd2v8/78416706328.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c090036ca---wesirudipik.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4802e118e31bf021f6d93609c1b37dfe/32997037474.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccedce3a4---95346221962.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fejalugulujaneg.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gudob.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/rexononuvejibufoj.pdfIn PDF document text
    • http://balone.net/_upload/file///vubomuxitapisutefije.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605318f656---ribazetopekadak.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/bugamerobezaxuxipezuwuvif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=medical+benefit+clearinghouse+incPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 10988 bytes
SHA-256: 9bc61b1b0365f70824499119cdf39aa97f14c6cf32528f1d5d214b86271588e6
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 17528 bytes
SHA-256: 8211dc93532e143f2e06a213513ec698ba41ab868c4520e68b7a5882b9a267d0
font_03_sfnt_off000155b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B4 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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