Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a2161398558f9…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 12:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4fad2a5874d3349bed210f891a9f7683 SHA-1: 14c72328066e8df60e59cae641b079d4492e1117 SHA-256: dd8a2161398558f959f16add31de911262a679c2d3a85145ab4646e93339386a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content delivery. Heuristics indicate these are likely used to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=definite+life+intangibles PDF link annotation
    • http://mama-care.com/UserFiles/file/rejujamilesodip.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210907174455.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ddceb4df---75313220200.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/jideworon.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/85992087922.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/govedaxososi.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/fakosonefekidokinibusodes.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/53399091912.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/55869927182.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/91668088394.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/rogoro.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/2469596804.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c13cc3a9d---biwesopebaxivudigisa.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b678c3f07---29924640054.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4931ff68---bopoladabevusaf.pdfIn PDF document text
    • https://educhina.mn/editor/files/88836181991.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/muluwen.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kejomepor.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/semizojamu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/28569623987.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a11ae6059---3869519232.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/defasan.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/xamogajogutelotopuzili.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/43898948501.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/dunut.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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 10308 bytes
SHA-256: 27ceec602aeeb563485ede682efcaa06b5ce8e80243fb34f268517550155df83
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 15148 bytes
SHA-256: 7bdcd6aa2209865f4fa04195be64f08b1db081260169fa1ddd07d6633f0c7536
font_02_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1