Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36977c27deed0a4…

MALICIOUS

PDF

69.2 KB Created: 2021-09-06 09:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 713f35802f52c99e34d80e939d465b6c SHA-1: a0eca7c65a02e20366e1ab2de3ad2bbdabf8473e SHA-256: b36977c27deed0a4a7c595d92c105014a321de57014da9b5b9c3a1cb22e9ccad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including an image-only interface and numerous embedded links pointing to compromised websites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to redirect users to malicious content or facilitate credential theft. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=short+vowel+sounds+worksheets+free+printable PDF link annotation
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8e26acede2035f593aa6a463ee432b84/biligaferu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/67696174025.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/powoxadokatit.pdfIn PDF document text
    • http://blgjad.com/upload/files/xuvafujuzewibozo.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/soxuvene.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/lewedewodizopabew.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/178b8fe90dd94be8b13ee90e219eaabf/15373002045.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0d3a66a1---zatakizev.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/66560843163.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/84509896668.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/59720343456.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3e3015b6f27d7a9210f0818d5ea435c8/79941570934.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839c2e3ca59---burifaziropinomasura.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/10903111775.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/9973604772.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/96244092349.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wogomewuwadexugowulutut.pdfIn PDF document text
    • https://chp-travel.ir/data/file/80569974435.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/rafitabemoselavuj.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/90376887689.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/wafudaseburoviv.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/zizudinekoposavuxujota.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/50f4ce850b98ab65d6be2e0e4f162b0a/64972371219.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/92152703854.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/77317767407.pdfIn PDF document text
    • 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_off0000b142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 11152 bytes
SHA-256: 0e478c4983c5f323f357593e5744c74bcd7cab2055d6e71a04589eeb3fcaeb04
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 14388 bytes
SHA-256: e7712f87a34712c52012c52242679a4c0e1317c0ea05d5985e9218036db6238d
font_02_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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