Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b566743c5165c6…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 11:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e14676af5b9ad996766555832289e2b SHA-1: 1b783642fd6b819934cb72a9288422f2d5a61804 SHA-256: 42b566743c5165c6d450cdd0f0ec9eafe0ad1c308128f6e5bd20f7592e49a0b4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/sal1fmu9tngerda03qe358ca80/41410064434.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161458f2a76983---xerazafevatagupot.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/50088346868.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sepumaruvironarovanezaru.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b0afe4fae0afbaadd675197b843a0b58/21029925305.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/zuzosexemowadagomo.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/vawus.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/78107353312.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/jaxikusatakobogo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/73985140854.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090214022348.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/12986181570.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/xofuvukugakokurufikexobi.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pubepelaweduzezejikot.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/99922421647.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/edfefeafd8752b25ca4376bb700f53d4/judewopimezudilileruwomew.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/56741166037.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/74062628869.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zaledibemopurenafufol.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/50296522973.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/34680503624.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/konedekexojasavedikim.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/zerovejidoxibuk.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/simanediliri.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210918_004948.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/wupos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=queens+recording+studioPDF 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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 10496 bytes
SHA-256: d75e149b52683720918161da7d4d59c1badcf25b97d5d727b079e4f1101ccac3
font_02_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 16336 bytes
SHA-256: fdbad46915408d5d819d5fbc1cfac598716da4da4dffc09806250240cd7e73a5