Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a73c62ba943f7a…

MALICIOUS

PDF

85.0 KB Created: 2021-08-12 08:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54f07b341c03721170f20e70f06917ac SHA-1: 79768d73eb2330a6395b4e5dd41dcd9633b7934b SHA-256: 14a73c62ba943f7a5c837fb1aefbe23bcbe871591f0549bad914313b027acd9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=bomberman+2+snes+rom PDF link annotation
    • http://shop-exclusive.cz/userfiles/file/xekibibaparene.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/de524d58bde67d4a572878e862e57898/44705855729.pdfIn PDF document text
    • http://come2menorca.com/images/file/57604224982.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dd8ae26ac66b017a966ccada39088d7c/67562995874.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46539229280.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b950e815e0---93542447264.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/vonapisifu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/70680481515.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/dojijaborugig.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-5/20210605043042489331.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/pibozozokimotinizu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/94670645982.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/muluwuse.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/316f85ffaea6e1dc72601c42a5026b9a/57612852864.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/drbjuu8upp0m3op07lsua0pmb0/17873479015.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/64864840671.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/jesibexodigidakoradelefim.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/tinedeloxexo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/21674970123.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210705_3AA04DFE7E9C1834.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8ba34955---pegekireradipazona.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/latonivifuzun.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/fuxogasonozuwolava.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/80d640068091131dcc44d238ccba0846/dafibavofana.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10348 bytes
SHA-256: 899de0b2057d912751f6dd2369f61c9a9398ca21cc82085ef6f4eb794fe672dc
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 2384 bytes
SHA-256: b4b43c1e58e826b3ef62b57e615ecdd935b2e9551d75d5dce6ae50fdcf892db0
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 17332 bytes
SHA-256: 3bcfc8876516b4d93f5c1f9403b53724fa846a3c9bfbd8f5eb455a7122cffc7d

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