Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d9452df2c5f5c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 09:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa5e868ef13353beef04a729cd872ab8 SHA-1: 886a123546ef9c699b309000f0d21d9d878f7f69 SHA-256: b37d9452df2c5f5cd230684a26c1f677f21c7532997a639952b7a230e236b51a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://suncables.co/images/file/jumabifawabilelonoga.pdf In PDF document text
    • http://khamtribacninh.com/images/files/33724782857.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/69306887689.pdfIn PDF document text
    • https://breedlife.com/upload/files/94828365735.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e70ef6ab74---daxetunejer.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109161645515978.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/5426761154.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/77270335425.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/70746143170.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/19799574256.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/77b761d4a81f88f34fcf9ff7ab76587b.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/87214974706.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613656b0af5a9---10018009697.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tobawimorexo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31723491887.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091214080673499.pdfIn PDF document text
    • http://pronobile.de/catalog/file/mopadiwawabitifogorage.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e7299136d36449ec6a86f7a628c5c3b0/galekubadinuvi.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xetofojebibegobosukamox.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/62324161795.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/neberiketeku.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/77531686340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mortal+kombat+mod+android+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 19228 bytes
SHA-256: ed71772b10d4388bb4bb3cc07204f2b9d3cbff7658bf277a48caf760a57974d4
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10384 bytes
SHA-256: 64ccf62dcb45b3c38548c2e4b23a9f919fb0bddf7ac5f7ae0b1116013194352c
font_02_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1