Malicious PDF — malware analysis report

Static analysis result for SHA-256 b723218a40caabcf…

MALICIOUS

PDF

71.5 KB Created: 2021-08-26 12:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9cb2bd3208f077b3cecf5b55399e095 SHA-1: 52f5e36c3cac662bc143aee87f4badf7836c3348 SHA-256: b723218a40caabcf9014ce75d7ccb9fdff65f086b0b86e5a6ba6f8ab28e25801
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=fourier+series+solved+exercises+pdf PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/39565970962.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/21414591487.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f9c8e8a2---48290589475.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/setunigalatew.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zapijumipuzabopeko.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fc4a356f08b0b443cc5abe154efa3ce0/bawomofume.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cp1ul9gr6qodpo9uus0bf1ecpc/lavurujesoligigefatukeref.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad64ae9bd---34926341499.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/86547532140.pdfIn PDF document text
    • https://yuktogel.com/contents//files/zeteragos.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/59221081634.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/41907235147.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cts7h0aqses86rsh7n79nd2pp5/63791617248.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/112977ac8d3e685b1a0960cf2f440448/85009311836.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/tizibupapekave.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e434642351---dawejipatetikudif.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/61781778819.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/31246983111.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/7818564495.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4a07485d5da96217c943d980f3748e9d/nimoridelumisiteligabaliw.pdfIn PDF document text
    • http://inncredel.com/uploads/kevubofumi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/de73fe6426bbb3ee92aab2e35b4d652e/putilaladumobob.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 14860 bytes
SHA-256: cc1cd5b956abb8ee00e2d62530eee31f8b5e7be3e87c81718ba25f22ac1e2bae
font_02_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10496 bytes
SHA-256: e94e161a00626326350ceb93190f629ccd3217e2c7f270fcf5f7deb1a7b69e8a

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