Malicious PDF — malware analysis report

Static analysis result for SHA-256 885dbce10822088a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 04:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89f797c93dc4e7e05e707f6a12d3f3d8 SHA-1: c1d9b788f7c4475d088b50fdb8c0d9d0dc5d73b3 SHA-256: 885dbce10822088a0827d57f118db9c7321123ada19fafd9d54d947f1ed7caa9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://burbank.kopanramen.com/uploads/files/28302164.pdf
    • http://eptesteplelek.com/uploads/file/fizaw.pdf
    • https://manuscripthandler.com/userfiles/file/88520184805.pdf
    • https://pakianco.ir/data/image/uploads/news/files/najizitiwedinide.pdf
    • http://kingkady.com/uploadfile/files/99437881280.pdf
    • http://elateridae.com/images/FCKeditor/file/78609108713.pdf
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/vezozonopitinalup.pdf
    • http://houselandia.ru/files/wubemuduruxekuzonu.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/20474375982.pdf
    • https://plasy.com/uploads/file/60464966725.pdf
    • http://tiyuchangdi.com/upload_files/files/20210906_082509.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3a7dac79---20638249617.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138953cc55b2---xitogefijukexoladij.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/zowidizarig.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/56458115172.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/92358691978.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/vitatoludawuxusumarufuvog.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c362d4dbca3eefbc65ff37c7414d7e9/39990553470.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b0b126ed83a5c3555c7730e87fb4b752/defir.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/zifefegepijokosub.pdf
    • http://nfrostov.ru/upload/files/94273321864.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/zadebofer.pdf
    • https://tepihtrava.rs/files/96811822567.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=colin+mcrae+rally+ps1+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b36a.bin
d920b468725569ea22436ed8b7b582e504087fe617188ffdd7768199995ec53e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB36A 15788 bytes
font_01_sfnt_off0000db4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16792 bytes
font_02_sfnt_off0000f363.bin
9213f1dcd1b6766b1159ae0ef750e9a1873e6ad9161ae83249d9312781c69a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10636 bytes