Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2d32bfb8ef2dc…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 19:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 746fa31a76140dd77b9f1699813f4329 SHA-1: de5faeefa199976db2f43ad0a428b4c3cf9e1956 SHA-256: a4c2d32bfb8ef2dc040c052bdee834850ae0707c0c40a91797a45b704e31b00c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mygotour.com/FileData/ckfinder/files/20210824_B991396599E63203.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/musasanisobowoj.pdfIn PDF document text
    • http://zenithmetals.com/files/81271919561.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f10cfc56---timinopotu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160778245d37e8---pitinigiwejepalixuwi.pdfIn PDF document text
    • http://hydrem.ru/images/file/movedunedu.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/3114732244.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/17600141075.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de91714a3---90545500928.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/liwunawivudekekipig.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/16752977468.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7f491e53---14128553579.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa48f387f64---jikotanekamotaridewoded.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/lamiteforexaso.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/jogatisazoj.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/pipafotawemonog.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e8d4f88da631ac212ab837f1fe9720bd/vugaxaragegozenu.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/wetelegivul.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/41803008132.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f08d14d23---90919920808.pdfIn PDF document text
    • http://cy2hand.com/userfiles/botipibotojonofefikuna.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/71586622714.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/029715514c84f1bd2a2d115468eaaaba/fizunanogifisowakotapo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/2714722959.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831de62bff---xigib.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/53641123491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+billionaire+boss+next+door+pdfPDF 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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10800 bytes
SHA-256: 50d187ed890f4a6160755b72571903699eabe481ab7b71469b03750b864cfb09
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 18100 bytes
SHA-256: 154c1c128f9f02b89c9a898ac2160e5ae3781431ad06daf6b5963bb6894f8ec2
font_02_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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