Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d541c0556fc4b8…

MALICIOUS

PDF

147.9 KB Created: 2021-06-29 14:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9035650fea4094e043bc2baf078510a SHA-1: 1833f10f195c6808c5b2133e02740753b83c2c65 SHA-256: c6d541c0556fc4b82bb259e68fe8ecae0cf123cdd656e52c42236ac19d47d984
204 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest the PDF acts as a lure, presenting a download button and password instructions for an archive, which is a common tactic to bypass security filters. Numerous external URLs are present, many pointing to compromised CMS upload storage or disposable hosting, likely serving as part of a link farm to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9565

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=saibaba+question+and+answers+from+dwarakamai
    • https://wegofa.com/userfiles/file/65503104298.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/440239b9c7aafe863d4bf772d73bae7b/96890719757.pdf
    • http://pn-tech.net/userData/board/file/vobudesegali.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/c5ak92ufn9m6774dqg5ihs1im8/41974348910.pdf
    • http://villa-carlshorst.de/sites/default/files/file/xipowizutubop.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jfb3hvvkad97ihh6mvrqjrpu95/51576166178.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/nagitalubiwudigaz.pdf
    • https://allcreaturesinc.com/files/files/xudukigexego.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hsgfnjcseh03rkvmbh029p83j3/zigetunozufuronutavezuzi.pdf
    • http://evansmedia.ca/userfiles/file/sixugaradidavaz.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a314eb1c6e8---jufakakajil.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1u31c73vvqqclen9qsavml6v15/98711568752.pdf
    • http://haki.vn/uploads/files/sudafokuza.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/mqv4rireindahu0sbae6i37ic0/jegenufunovamoris.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6hg1k497gihq2o6ti9to2pfov5/xokusudibosaxumewo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/009717ecbc3d85b9c6a1e51d8e48fd2e/dimiz.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/46030955760.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d04d1c42dbc344a1a52b46f6c1fc977c/peposo.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160999ecfc8fbc---tinese.pdf
    • https://beatmuellerfoto.ch/userfiles/files/xixedukinole.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160830392bd5f7---67343827351.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7ce36f6d---dexavobu.pdf
    • https://kawanmto.net/contents//files/salazigodekukezoriz.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9a1426a3caf677e7d3841ca253264f0e/zubovuxuvevewudowa.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mcmidhk0fvhmab7nlbnq1722dt/zajijilutozumob.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001af0f.bin
072c28befe23c6ace284ed3f4933e13af919927d0bb42c494709a70029289729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF0F 11108 bytes
font_01_sfnt_off0001c8d0.bin
b981da4e25200d15d4771b6ea14fc262f8047ba1829be2f1b287e12aeb8c321a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D0 23888 bytes
font_02_sfnt_off000205c1.bin
9aec41003625894ef2c1b86717ddfff1d4eeac40f3f6c98bc01cde29673addff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x205C1 2512 bytes
font_03_sfnt_off00021049.bin
0fa97fbaccd6e3681d7a19e709012d4dbcbe00a5837ddc3450c256f2421cca28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21049 16308 bytes
font_04_sfnt_off00022662.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22662 16792 bytes

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