Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa095eb74e1fd6cf…

MALICIOUS

PDF

72.3 KB Created: 2021-05-09 01:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28d1f75771f05cf383427d8bab93ea6 SHA-1: 90a1691027b08b9f22a6ca6e912f722d9c9b7065 SHA-256: aa095eb74e1fd6cf4f94fda59f3c71002d8cd28f7b112607e6541c02a635758c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the nature of the heuristics indicate an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9dcf3621e---78812953934.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/45d7bf79276af3b908090e800e8dfa19/jojalezemipinekuz.pdf
    • http://aj-logistics.com/stock/userfiles/file/wuzojopub.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1a6c8beb38bd7ff2bc36f36f03706fd0/66527273501.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57d74359a---78487487276.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a5c61b1a84ea951d02cfbdbb3213447c/83373855374.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608816068a3c4---95833970180.pdf
    • http://architects-desk.com/uploadsfile/88586375108.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084cad430600---5844511910.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b6c2e98fe0cb6f4315bfe25954a0c4e4/1490358287.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e112cca9d1---daferadad.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/lddsoavavo61cspbfs5e66nn1k/mofuxevalefotemujupomiwo.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608163eed88e6---60719179329.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jvns9lc05a5biorpdgka9ci45v/85140923926.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/nusab.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086575ab0015---bafisabisisisiziv.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823722594aa---viligexumexivarijupotel.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4acc7165e8d5d092bb6cdf99f38488ca/fotuximotuzalif.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a24b788---33797198628.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ff3635bf925684bf6f157d184c5f495f/vevegipafunawafonudej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=el+ultimo+virrey+del+peru+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16f.bin
a2b3fe0256594c890502226207a33b25105044ec01164600f1194658868c595d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 4920 bytes
font_01_sfnt_off0000f229.bin
b0c7e1f66e466d029bb2d553569a9a6c285db4fa1c7f7d7816131a4b9816f402
pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 11280 bytes