Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb20a1e7a760d24…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 23:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1def77da8283b50ab6865ed60eee2e9d SHA-1: 9f30ba2f68457cee5426f53bac939fb79a92f2a2 SHA-256: 4cb20a1e7a760d249f80df0594ada1b604f17db2015ec4aa8d5681df622c1aee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous PDF files hosted on these compromised sites suggests an attempt to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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 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://alianzatours.com/imagenes/file/51066691687.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077483f51839---87572091566.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3a585949bfc4844962b2455d4591fb14/bonetazoxirixorogageliveb.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4d4e79ae687a5f0f91997f04625412f7/95336726013.pdf
    • http://tokyoracing.hu/userfiles/file/surupewonizasazuvukonipap.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mgdoorkrts4kgo58shjo3e68qf/72146170724.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0000c15941---28613861913.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609f6d6d18---bepamarusoweri.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acab0a0906---lixozopedepepalozuji.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/398d549db23d6428590b049c727b5907/nulotivabeminadipedita.pdf
    • http://mwflower.com/upimagesfile///12154674930.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ce4f7015050c16b1e6197703806774e1/63191481433.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/849f09930d4327bd24d6e75e8853c761/59735308545.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7faa06e6---48714203307.pdf
    • http://geyikkimya.com/userfiles/upload/file/xarutodetup.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/34054245155.pdf
    • https://cncostruzioni.com/userfiles/file/93284174832.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2c583b625c701a6a2c2ba864146225b1/jagoxivuxufogifesife.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3f29d652---morebabomenutuko.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3d4f2669984cf98b4d1ace89bb8dbc55/5867174173.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f63d7b6fd---batikefevajiviwadizaluxi.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3irg8i7h8lvbefue2odt990nu/jefebefevinusukoke.pdf
    • http://sumosushingrill.com/uploads/files/lezazobobakukaj.pdf
    • https://blokhol.com/upload/files/68032120893.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nhqlg0u2mpidlhtdgsqq6aq914/5803263803.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4re35bbuqpcih130kdjes84845/39212927720.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c5306ee1d5613f892c3de8310600cafe/wibisotefafago.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wifi+direct+download+windows+10
    • 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_off0000f621.bin
28c95a34c89d8df35ab7e56e42400745e61d2b7d4659ba23e84c1327191dd039
pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16624 bytes
font_01_sfnt_off00012140.bin
4820d60916206b04dea71206da12cff11544611e172b909f623f50a38ffa8bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 10724 bytes
font_02_sfnt_off00013a18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 16792 bytes