Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb02dc0398d56c82…

MALICIOUS

PDF

82.0 KB Created: 2021-07-06 00:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5b4c5d353d4b1f436bb6af17c1919570 SHA-1: 9369f8a2a1e0d83e25a832da7ce1daeff4a5acca SHA-256: cb02dc0398d56c82fd8f4374ef9e571fb17aa0a00d588a5eba996f8a5e3be34d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://shipsupply.ru/userfiles/files/58783395787.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d35a712e9---vunamokaduwigulo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/zubigafujija.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/rebatafoviv.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/316b8578bc71b0b306dc3be73d096a65/masakipolig.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607216713a49d---30043822404.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2cb78e4f5150e4461d6ee75a48d3de73/zeneropukojebatuwof.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/82632944381.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ac54e529---19675148763.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddee0967be---gusiku.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801cc3e2e6e---22517435528.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f3932036---26945209408.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a019dd3nve1ilka62i30t7ai03/lurigisagemofovunuzifereb.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1625c2e76---57439609252.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/nuzutubujopifamu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9052d799---28259803967.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3bed0b0e---wezawadudumepiw.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099628fc5fa4---xetukigikujufotijogogik.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efbd0f0884---lefefawulefuwurelixariwa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7d3295058---68785165951.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f47ca87---gifubuvokuroxozokipobe.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/78427938205.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/vetafimotugopal.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/30341178693.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/43425189521.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bcaa7061---4634598646.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zimul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=atwood+8525+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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 17156 bytes
SHA-256: 0b82d7ad183f82c6e6a6b87a5ac5d8e4a266cd214227e9c2e6c44737252c2304
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10544 bytes
SHA-256: 32e3cf5f845205fdd09ffd7ae4accf2f94ae272c45a686f9d25df07f294a91d7

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