Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cca21222382246…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 18:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 932254ebc92d49c1a22a308dde8d9611 SHA-1: 9bbf2fc1390c5492ecfd5578d75f7a4d06738087 SHA-256: 71cca21222382246ba303a884a4fc7c0d8caccfb6dd0aab74f7247bc8c6c7613
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

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 http://www.gieskestukadoors.nl/ckfinder/files/files/92063789664.pdf In PDF document text
    • http://woodbridgeabw.com/uploads/files/ganosezedavi.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/13008412817.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/sosenanuko.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5fd85b839c5c8cc092124807a88d798d/55055150849.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/3665077855.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/14668690270.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fubatanapevemubalupufujab.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/22806735298.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/quolfb1tqbcl05thkqeb1sjo20/10191208028.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c57d2fdd---fabelobamugiximaw.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/nuzigesanenoxilugifodogub.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kilagetujunoge.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132fad2b526b---45806058052.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/31971597086.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/90325583655.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xasumami.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/likiriduvevobejo.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zumalenunixox.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nazudasejib.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/45349630675.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xuketinesik.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/94822160163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nba+2k19+for+android+free+downloadPDF 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_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 10716 bytes
SHA-256: 1c5a5ae41501ce6b894ed0fa4635f1532d62edd8636d829bd95ddb55a0785c78
font_01_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 17264 bytes
SHA-256: bdf19e6e5b1d2ddbdfcb1f6a5678db86f1833cedac00545842648be9231ed9ee
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1