Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eea079bb747b8d4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83b78f1c64bb3bd2d78f2e379a107c33 SHA-1: a86715bd3c25bb13cae270ffce60273b7662510d SHA-256: 9eea079bb747b8d490b212268cf615f3533e049f2791fba67c1e43808061b0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or SEO spamming operation. The PDF structure and the presence of multiple links suggest an attempt to manipulate search engine rankings or distribute malicious content through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yuemeism.com/uploadfiles/files/9106131457.pdf In PDF document text
    • https://mehreganimaging.ir/images/upload/files/fefupabiluzugajudaf.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/46994229859.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/50266334235.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/tawuxupuvutipa.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/busogakiwenem.pdfIn PDF document text
    • http://asustainable.com/global/file/94248133875.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/92220500465.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7n796g9n5866hmpjrbbkas7fv4/37589674523.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/81079573074.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/67b805728bff38e2236e7754c42beda8/kulonuxenamizedinewi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77e26cb38---mifezesowuru.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/84917070594.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/91575558980.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/92574604386.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/refula.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pubigifezane.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/dasigesuj.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140930e0e3a0---kiteranifolepaloforuj.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/19566496190.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/xigako.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/rafexixezuwerizigepaw.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pabetogujesobas.pdfIn PDF document text
    • http://keitbg.com/images/files/4556257907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=telescope+apps+for+androidPDF 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_off0000bb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 16420 bytes
SHA-256: b68c55c8cf7dce54901b8db9271318c9ec8d6bf45c5547279dfc4a6e9bd5784d
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10476 bytes
SHA-256: f6109138d76c7b0889589cc88b5afaefcbe253286ba9ed786cbabf735f7eedec

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