Malicious PDF — malware analysis report

Static analysis result for SHA-256 403ecb6d8b500cdd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c8c19a9df9b43656e20e60dbbd0d1e8 SHA-1: 3e8784399188f543ab13e2633f0ef1456e442f65 SHA-256: 403ecb6d8b500cdd0250f5646186a32db36d01c8a53c5f5f219c7f6b660f99e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs forming a link farm, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure align with techniques used to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jozipenewivemu.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e0804a7ee---19159932381.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413a79ddc1d---53029827516.pdf
    • http://skkl.cn/filespath/files/20210917102549.pdf
    • http://fkjz.cn/upload/files/2021/09/202109071744122189.pdf
    • http://gamecoast.by/uploads/files/74530175550.pdf
    • http://jafra-com.at/userfiles/file/33113123249.pdf
    • http://aptekadc.pl/userfiles/userfile/fawezutukewagivi.pdf
    • http://szwygs.com/upload/vikifurifuzefodupisiko.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/73570436305.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613de168a1317---58825250726.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109192157185852.pdf
    • http://cachnhietcacham.vn/Images_upload/files/27224514286.pdf
    • https://realxenon.ru/uploads/files/65293522843.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c990e8d8c1---40652248273.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62035178920.pdf
    • http://sentai.cc/data/file/20210913_045018_541.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/56443649161.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/zevotufeje.pdf
    • https://promtour-rural.ro/userfiles/file/wikigem.pdf
    • http://motovelo-nmsk.ru/userfiles/file/57190821717.pdf
    • http://presssimayeshahr.ir/pic/file/navesikejap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=offline+music+apps+free+for+iphone
    • 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_off0000e3b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
font_01_sfnt_off0000fbc9.bin
01765d04b7368920710a4696e3f371b6f29815e7165fff2109a5f02ab8a64ef9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 17728 bytes
font_02_sfnt_off000129c1.bin
6c23fcf6421ab2e580a16044c2e385d5b81e9ef4bb4cabd03a3515cce398be20
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 10772 bytes