Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6088e52a556d05…

MALICIOUS

PDF

102.7 KB Created: 2021-07-02 17:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70f7123a8c70409e4ba291fba4fa1ea2 SHA-1: 6846009dee08c21b37d9d28609d3471d297c3360 SHA-256: 8e6088e52a556d05df04692b03f70ef1d7368d7278a343c1e5d7891213c81f55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=who+fears+death+review PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f72699bef---1203090487.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rcodqmu35ooiuli922p8qgiis6/tolagavejujaduwevi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gavhjsncq4vj2il20nbl87r4ln/zudabidepovowebili.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/murefefow.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f78e9f5820997db3db46c13187e18efa/zanafazetozelukodub.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be7507654---lotefikufalow.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/ramogiraje.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fapasir.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608324723d043---15404796653.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ca099ad820d71d75b98ee3dfd5d4e6d3/79099509566.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/prgjcop33rk0ssk6n9qoofse01/rokenujinon.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/logotusenulu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/864590d1e9b6858e11d39709a42fca39/63272110768.pdfIn PDF document text
    • https://istanajp2.com/contents//files/34316246213.pdfIn PDF document text
    • http://airsoft1.ro/files/file/86389139781.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330355b552---mubelukiz.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/sikofoni.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab04547809---luludutizan.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0fbdd84e---32934463731.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5b734608e3460be153f034b3fbd60dd7/jatogedisaresib.pdfIn PDF document text
    • http://askort.pl/Upload/file/bivejiwevetabulupup.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30542095304.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/33785dbdb6dd54e853f494e7d89f4d60/woxalidif.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a57e82a0---96113082707.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 18112 bytes
SHA-256: b6b2587c5399151c8874fe8a7436fce9614ed164268bbea479b1b61c61f7a241
font_01_sfnt_off000146f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F9 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
font_02_sfnt_off00015cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFC 10444 bytes
SHA-256: 7ded45422dbf85efd051865d7755fa82592265566b9328cfaa5fb448268c9614
font_03_sfnt_off000174ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.