Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40575e7ef35ff63…

MALICIOUS

PDF

142.9 KB Created: 2021-06-29 20:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97de47de2d4b6c3ad9e9ee49902f0440 SHA-1: 77f78b3e541162f554b4040fd2c73124bc3b6c5a SHA-256: f40575e7ef35ff6375d02d8b05ed6074bb5d4900ef48dd115842a4d570047ac9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 6

  • 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 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607883fb14a72---fexujalep.pdf
    • http://krevue.cz/UserFiles/File/89317436277.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa3db3ac6---58137972883.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e960190ba8---xuzulome.pdf
    • https://energooptima.hu/upload/File/95475763395.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3dc608deef24e1349455019d633ec5bb/71694975036.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4b5b7439---986582875.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609289b533214---geviteveset.pdf
    • https://queensflower.nl/clientfiles/19058027578.pdf
    • https://go2germany.ru/files/file/pawowux.pdf
    • http://daehwa.info/uploaded/file/zasafi.pdf
    • http://jiuxingchaoshi.com/uploads/file/282335394899.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502045904427320.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/62cbeaf056f2ccee2fcb50cc31fa9c99/kowir.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/84620584582.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jolit7ab8hjuhup3fs2ldmc2ip/gibugolepagadizevamozo.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84b43070b---jisizuzexulesexa.pdf
    • https://hasekei.jp/userfiles/file/87501881359.pdf
    • http://sumterhigh89.com/clients/863574/File/gitejopulifuninukoneku.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764cce71306---67477689663.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dbfljr5hh8i215aaocmabqe9t4/42518230037.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ab8ca6dfd---nored.pdf
    • https://juhaszautovill.hu/userfiles/file/2162853808.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=will+be+going+to+be
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bf.bin
c06ede35ecd30503cb551d664905d51f935f85b0dab495dd161a9964ef808b37
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 15564 bytes
font_01_sfnt_off000110ff.bin
9789bc6ca62c6832d01cf66e323b4616dd026fd44a099ed4e9d9386e16342104
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 9984 bytes
font_02_sfnt_off00012735.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes
font_03_sfnt_off00013f43.bin
5561e9c5179e7b53d5393526eea7b8c7c9b203b215bbf07a6425b02f6622b731
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 95560 bytes