Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c9f3a6153abe8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 01:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebed9014a6617e0d1a206c058a347bb5 SHA-1: c71d775671d6ef9888d5edc8ec7ab436f745d143 SHA-256: 645c9f3a6153abe83c4bc66006777696541227bb0dd67a6cf48c371f076e647e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The primary attack pattern involves luring users through a link farm to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdde408b1---58630130339.pdf In PDF document text
    • http://icltindia.in/userfiles/file/71165742112.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/64769676984.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/72543902390.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192111425.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/89372927756.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cd3846eccdf8a6454614338172a80d20/16467525080.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/sikeb.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kideguwakujidali.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/zeporunolizaterokax.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/xudikibobemi.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/41556757076.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/xenumesusagasiriwuresik.pdfIn PDF document text
    • http://trovas.com/userimages/25106981432.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vozinigesenajefomezar.pdfIn PDF document text
    • http://schokofontaenen.de/idata/daligusoluf.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/matubepofujavugewojel.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050123060430.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/paxete.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///vanewokenap.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uvfdnb3mgq5ud2crhl6acmj6g8/84994047244.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/kozuseb.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97813e7810---50724717393.pdfIn PDF document text
    • https://semut73.com/contents/files/16718539499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lg+75+inch+4k+tv+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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 18204 bytes
SHA-256: ed586050f9815f3b07b643cb30ff29fb21841c9d337bebe8675954906848cd29
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 10636 bytes
SHA-256: 8d3d555ce4e4a8383c40f1fa93ce177f699ea432f042c784dfcc94c8f705e03d

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