Malicious PDF — malware analysis report

Static analysis result for SHA-256 983d1f136fd9cb8c…

MALICIOUS

PDF

79.3 KB Created: 2021-06-28 18:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a4444d50698d28e7b3e94f9a6996872 SHA-1: ae71ad1bf12d7ca4b5b7cdb7dee39604d9f748a3 SHA-256: 983d1f136fd9cb8cad608c3bf2b729fad9c2cd7867be219ca473a09841f2345c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://avgdesign.com/userfiles/file/viladozewu.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073c53d0f685---vusixijo.pdf
    • http://imhkayseri.com/resimler/files/49899224760.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/281996721ba079562c642587381fbd8c/96516160322.pdf
    • http://mazdooradda.com/userfiles/file/pabezubupiwunafe.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/77586d3a53d807a8606d5ff228c715c1/9279363151.pdf
    • http://thienlongadv.com/upload/files/fagazunivive.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6b3b47e9---12608363060.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070515bf032d---movurilukavugivupi.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/0d3b6c7bb26a48255bf4642469ef2314/majamil.pdf
    • http://all-pass.com/folder/editor/file/15514903788.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/244a6da2c4c7125a6f287d85464a357d/1732747053.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ef63cd370037bdbc21c5d7aeaf10caed/99115795338.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/53321871854.pdf
    • https://idd.no/ckfinder/userfiles/files/79079143396.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a947fca11fa---15748512957.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/42f947a22b9868fa9dbd2175c058d889/mefudojewototedowato.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6968e8d55bd98dae20b8edd7f9c11422/xekonenazesumamezo.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/40535256423.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67ed614c2---2055833570.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab672770ade---butuzibogitewipurolirez.pdf
    • http://spreewaldatelier.de/img/editor/file/tigilaxugakedamoge.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8fd34a107---98040795744.pdf
    • http://4seasonstours.in/userfiles/file/44951705059.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=copper+sulphate+with+sodium+hydroxide
    • 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_off0000d30d.bin
bc38d0985ada51488fa5e526aef2cbce73c4575539eb4a9e2e52bd82de6207ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 16804 bytes
font_01_sfnt_off0000fe43.bin
052514ac6b9996c70a91e9841b3efcdb1eba5cb0817db6d3a563d0705d2415d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10984 bytes
font_02_sfnt_off000117e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 16792 bytes