Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a96a62911e2b8…

MALICIOUS

PDF

79.8 KB Created: 2021-06-30 10:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d8a374c66fca95f7a8c7f4b4f970921f SHA-1: 61898ba4b4424ba352526a963655f0ca560d9e93 SHA-256: 340a96a62911e2b8aa08c84850e05f53e9121d16267489a0a28521ad8fe83a0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external resources, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading a secondary malicious PDF. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yournamebadges.com/withyourdog/cms_uploads/file/guzur.pdf In PDF document text
    • http://interface-referencement.com/userfiles/file/39107805700.pdfIn PDF document text
    • https://wineart.online/userfiles/file/56923768703.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/r2cmmcs4v36akvo9bb84gj75k7/xuluwanun.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f7b73fe3---49067583857.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/2969284955.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/48238287127.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fuwuxamobog.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/jilemofidejugidiximinigu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b23f4ecc9df0417b45546617c41ced62/60112634501.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/aaea3c3d5fd9c0856a65512ff190dc5c/59388531842.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/17f92d9d87a7ae2e96ef05d5272bb3f6/64252894573.pdfIn PDF document text
    • https://ckmandarin.com/uploads/dobawi.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/31321375684.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lumomofosul.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/kosulovive.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vc4bqj9g3avdorcg35pc5qldmj/rotixikerazumiwifus.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/masenobuwuzov.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xigiloguwunarakimejejovo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff97422f91---55275761903.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/bukaxizawul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=chem+textbook+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10688 bytes
SHA-256: 3bb54627a200f276c3d67d57f578c8cacfcf100f2ce9ca48685f571f8a0da3d5
font_02_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 16928 bytes
SHA-256: ff2d6be1de6b8e80a22f7ffed73e8a793a97b50e7a1f40f08618eeab8352c2b3

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