Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a140e9c0a6e0df…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 21:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3f27847075f5df7d8a72a1e4c122abe SHA-1: c4e2dad3e6a9cacdf1528c33aab0fc0248e8ef28 SHA-256: 42a140e9c0a6e0dfe6c86ac6925e552e6252f0803b95f0643f3a1ea7eaedcd4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://biharlokmanch.org/userfiles/file/kizop.pdf
    • http://bright-mineral.com/uploadfile/file/2021091306082071.pdf
    • http://naturpix.ch/cmsimages/file/82531503510.pdf
    • http://yaqeen-eg.com/userfiles/file/fawuriwupoxolirobubose.pdf
    • https://wecareu.net/ckfinder/userfiles/files/24061391238.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/65712627367.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/bonavaminu.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2d306ba95d746a5e57f0b19475d44482/31342732930.pdf
    • http://runbo.net/upfiles/files/16310531696101.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e1nls47cjlkidhcd6qp0v6vj17/timinegofoto.pdf
    • https://agrimal.pl/userfiles/file/vexaguf.pdf
    • http://mazraeir.com/images/upload/files/89753589982.pdf
    • http://dnt-mayak.ru/content/File/nefufuvazanosonubalesun.pdf
    • https://smgbid.com/ckfinder_userfiles/files/tonerojapopedow.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b43325104---dilupezubuxobivegel.pdf
    • http://latiendasegura.com/contable_prueba/userfiles/file/gogikewafopofupabekiti.pdf
    • http://asude.istanbul/ck_images/files/89504180324.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1402b0d57---zewodusux.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/23656940764.pdf
    • http://twtime.com/uploads/files/202109071848504341.pdf
    • http://knipia.com/userfiles/file/35305795581.pdf
    • https://limsurdua.com/contents/files/51463923182.pdf
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/11492827062.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+remove+preloaded+apps+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1a.bin
3c8ef3875acc9e8e760f747abaf15df9f7174e386003288d28100516053198b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 10696 bytes
font_01_sfnt_off0000f49f.bin
6566d8036b8e708afa889dfb9092405c22776a9f66f7f7cb5d5d27545f9056ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 17420 bytes
font_02_sfnt_off000121e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 16792 bytes