Malicious PDF — malware analysis report

Static analysis result for SHA-256 38285f8c4f552ed6…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 14:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 797566c5943a292f474b684aba33a810 SHA-1: c9af384ce61177f0ca89345e37fec022b6e60d72 SHA-256: 38285f8c4f552ed62e86d6e92ef1972148b3f7a8412415fe66599325ccfc6387
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external resources, some of which point to compromised CMS uploads. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cpghollywood.com/userfiles/files/45695087034.pdf In PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/71425471654.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/83158458237.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7h025sanpui4sgp2nj200r2bg2/33936409711.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/rikazodunixon.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/wogixaduge.pdfIn PDF document text
    • http://mlight.cz/archiv/file/gopelel.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fed60f0d---wewusolajawexagobovurun.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/1878437466.pdfIn PDF document text
    • https://kapefashion.com/files/files/65562397810.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/buxixifuxabepojoxig.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/1313787743.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lowekisirorebigogegel.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9c7b120a22c264e2f4e4ba99254d65c/gegojukuzifuvasuxidujej.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/porigodi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384622e7e20---42173686013.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/jeruzarusinifamafosinex.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613436162b223---5894535530.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/raxizaratupewosokamenu.pdfIn PDF document text
    • https://fasleh.net/Files/files/vatelikitavuxobuz.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/sezazafasaxoku.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/2205680620.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/6813263635.pdfIn PDF document text
    • http://mfahk.com/upload/files/ketoxixodadikanadekan.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/bolixarawaru.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/42316957398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+shiny+gold+rom+download+zipPDF 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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 19628 bytes
SHA-256: 3aa0374d947a50896ab1e28de5d7ce55c2fd397d4c297e25987943a577278e56
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 11096 bytes
SHA-256: 91caa0d4ace57d474298a679f312487b6a6c13e48e8f73af3d0c9c2467abd6a6
font_02_sfnt_off000133fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1