Malicious PDF — malware analysis report

Static analysis result for SHA-256 67acf72b935d81c5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 01:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81509c08a9faaf584008840eec815176 SHA-1: 55a7013d0e58e1516754f5afd9b1ab5b688be6be SHA-256: 67acf72b935d81c5987ca17f7c40ba1c177dfad9656433cfdf60a6e5f03f587d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates the PDF contains a link farm pointing to numerous external websites, many hosted on compromised CMS platforms or disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://senhewood.com/d/files/bevoxedekakukariz.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jslth3gfuf2ajtm8d84epkvf5b/pemibudopozaganupo.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wurelusoxez.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/sefedanisotuvofudokev.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/foreb.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a83715e3d---95712264913.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/momeladiridanizubi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1ed5e58abe24f14855b8c22e975422e2/92452378282.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6df3304dd58366c3124a7166f7920c6e/xaxosikuluves.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e6aef5fa4db576a51ebdd879abebf3fa/foninipilun.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec6552a85---pigub.pdfIn PDF document text
    • http://skisun.it/userfiles/files/budebi.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/59328029157.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/84c8dff32387813ad7dfe31f74efe501/13224898870.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/m48poueppca96875bqe4ht65pq/42352135333.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b28c8a62f9713509259da00a90ddb538/kofojitotavidomol.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1d01c152f6feb9a7034aa40beb9c8aa9/walajenuzadosamesezu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880a1adc0---23280328818.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/59897896931.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/uqnqi3ksbk6uc7dr13n7qjp5q2/zumowamuzelegozazitonagen.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/56851156015.pdfIn PDF document text
    • http://teraval.cz/res/file/puzuvix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=singer+2273+manualPDF 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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 10580 bytes
SHA-256: afcc623e762bac351e01ad714b0a5e38b46082769a46c65eea6620940e08b024
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 17828 bytes
SHA-256: 11f1f3da199df504af2e7ff8f30f9c3ec6e33b307fb2456a318e7e590dd612ab
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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