Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9168d780018567…

MALICIOUS

PDF

80.4 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: 4e5fdfe12fbf663c4c64cad92e03a242 SHA-1: 17d402c61ac951bae6fd288b3d33b6320265c0f2 SHA-256: 6a9168d780018567ac652845c3be05521ba0fe7955cd09cfd09e74ad1374d0b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://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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