Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfed2b260da9b8ec…

MALICIOUS

PDF

81.4 KB Created: 2021-08-16 21:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3fbb0c8f9f7af1b883c97ded6fc7516 SHA-1: 07f1774ac2ad69b0d8b7c28de036e6f7a046693f SHA-256: dfed2b260da9b8ece967610f5e2d64b512f0946bdc16cc645841e4feec1a93ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to unknown or potentially compromised domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown PDF files hosted on compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jp-cable.com/d/files/14381811855.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5e216f7006abf2e1d324e6055b46d9b7/13824537575.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xajive.pdfIn PDF document text
    • https://milkyway-vn.com/upload/files/sekuxobal.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709557aee85---kinimefezomavubega.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/nigep.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/meriwuvilesogetomemuner.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d4dcecf0---vubilenit.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82351394872.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061600555359.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba28b1f10e---xejagidere.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/piturubixade.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210714054614.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///risuwob.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236bc71edc---fevasuvugojejos.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/lujogigatedanotijuno.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/saruxakaz.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1401f4b7bcda8b4715d2cf525931ee6e/rupigavabodufupazofado.pdfIn PDF document text
    • http://malifer.hu/upload/file/731800495.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d8fafaeb---noxetor.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e647d12a42c---kelimofafamil.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab8cde765b---jitudukemususejuf.pdfIn PDF document text
    • http://www.emailposte.com/pictures/luxodavatuvuwibosebew.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kisivutilipuzoveba.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ecoeau7d1dha1e57e70mrn6lhd/55543985116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ap+chemistry+molar+volume+of+a+gas+lab+answersPDF 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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 11412 bytes
SHA-256: 93c34bb73ccdda3ba08acbd555f0c0d7f23534d799ffaf0349b67fe1a42d6c05
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16784 bytes
SHA-256: 7e31b159d1479ad74225333640398cb740d30589ee1cc72bfc9a59967786b398
font_02_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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