Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3cd9f2649d00ec…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 22:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b04df3140de3e94c7da0adef2ba9241f SHA-1: 52a7b568e1b34a4bd65eb4118a24cd7a5973890d SHA-256: 4e3cd9f2649d00ec43563947172c6a91a008fa15c356e9a37361482c4661d125
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 websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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 http://almar-bus.pl/userfiles/file/90964774895.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e830d3e0ee5ea28a78e18dcf5bbb4154/saxiwatedewarep.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/74337614452.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085257074767---84264813597.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2be77fc2d---2267654540.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210523162177535545.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4280268322---boretuzafaxuzipekigas.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t2voo96n84cblssnua1cjvqf5t/35918096925.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/88191801665.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mub84d6497bhmgtn9g8q54ms95/68931046095.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa059474dde---71621396680.pdfIn PDF document text
    • https://ijpdua.com/contents//files/97091663031.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/cf5c04d9db867656c892490dbc9aae1e/58792047800.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/76129208159.pdfIn PDF document text
    • https://majubesar.info/contents//files/lejopovakimigu.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/86466343325.pdfIn PDF document text
    • http://gawwaclsc.com/app/webroot/upload/files/dozitetejojoku.pdfIn PDF document text
    • https://afayl.com/userfiles/file/67258720362.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-10/20210510124827895085.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/86059748278.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d9fee8690f4e1d424a7d6c51f142fc7d/37969568069.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/22407180227.pdfIn PDF document text
    • https://everestart.com/images/stories/file/wonadokafebafisax.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/87851696822.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/liwirojivudazipav.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/juzigatuzebavetor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+gentle+introduction+to+rosPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013615.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13615 18692 bytes
SHA-256: eb6bc04002fb012456818cbdaebad46a29cdb068e12746e42086ab44d83400df
font_00_sfnt_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 17184 bytes
SHA-256: 970d6945da07c46fbfe03e8dfb53a1d3fb21e37f909fd40c74ccd611b2bddc12
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 6684 bytes
SHA-256: 6ac7e9e7a29fc2da1ee0b50a5e656d42cc6c0b352990ca85fbf5890543ed4ab3
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10464 bytes
SHA-256: f5cbf1614fe7e70f895a2b84c75208217eaa0c77c00f91db0c0b37380dd4113f
font_03_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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