Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ab51343881a83…

MALICIOUS

PDF

97.5 KB Created: 2021-09-05 15:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12170a85108b7d642cdbb22a2c8ef3de SHA-1: 492965ea9808886c8328fde031196f7a96892923 SHA-256: 787ab51343881a837abae70d2073b1bf47f903fbda940feda237bd1c5b14cb98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=almera+n16+service+manual PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8debbdcd84c4764c1daae66ecab3185a/papir.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kepasufafenezuzanip.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/zuvuniwibibe.pdfIn PDF document text
    • http://terminsk.by/pics/files/latoxobojoxipu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mekigakebatasisojamog.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959db2ec656---43976733073.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/39935496570.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/42947935578.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/58429439880.pdfIn PDF document text
    • http://forti.in/userfiles/file/98556653963.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/18291301706.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e0729fe25---33663467575.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/421568e7432f9604f453f24fd7dbbbcc/vidoj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gd820o1sn3pgugfpgts3n93oa7/26868478143.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/78143714281.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/alemif7p3495fl3gdjesdtine1/sunixuwuvubekafigolupon.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/sunejaresevitafifopotaxu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/02ec64e4d274844753e58a2de99953a0/49599213296.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/50573916322.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/27785531941.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/ludimaduf.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/sikumutinevelipujavozoso.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_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 20500 bytes
SHA-256: ec4ebdf984c51b1c2f1a80cd1eca2531b8ce59a16532aa1c5a768766800f9bba
font_02_sfnt_off00016062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16062 10540 bytes
SHA-256: f19ce9eb888925b24f05dae29828a215621aa7925598610fb397c5af45269733

Open this report in the interactive analyzer, or submit your own file for analysis.