Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19727caa2ed64be…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 01:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3adb444376a0fe5dcb38ce2447fb69f6 SHA-1: 4a5c953614618b66b0ba497b4cf810a1e8e892ec SHA-256: a19727caa2ed64be334600e3487d01050033f1a81bd5ed92515734b27787501c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver secondary payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://menu2uplus.com/images/file/83198578881.pdf In PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/83585989778.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c67f35b897305392a824de728557ee0c/47193441131.pdfIn PDF document text
    • http://iphysiology.ru/upload/91266955502.pdfIn PDF document text
    • http://coumert.com/images/file/30940838627.pdfIn PDF document text
    • https://sambelteri.com/contents//files/37948725976.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/xuvagofakebodow.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e26aca89e---piwonu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5d5566a0b25e9a54efc8c7d641c91ace/tefotevugibeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc2d2fda0---94679608191.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e5fd8907d732c29893d0c9a2625da987/kaxukinasudotivoxonofinez.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/elmfeue84ndkqosaintamvld2a/jatan.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/10286780616.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/16529919021.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/pofezavedutabozuxapodiri.pdfIn PDF document text
    • http://www.eltomillaralhaurin.com/ckfinder/userfiles/files/funisegur.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/vujuzusatebajudovid.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/39157385479.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/14597001474.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/rapujagutudofibopezi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dbb07b59f---37396046349.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/410d319b33c2019b797de40968d54ebe/dojenupanunexuzati.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01e978f5c---73546576344.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/40344210928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=firefox+won%27t+open+pdf+in+browserPDF 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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 17560 bytes
SHA-256: b8def328cca85c58c58a55b44dd0e89180087b0921834b02bc8705d71ef97135
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 10620 bytes
SHA-256: 45cb5c9b691528be2501fb72f0b4de5d446dade3447f05f5d0e98e7fe3a25589
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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