Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42c21defc77817f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 02:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2341403c7a98a35e3f7eeeadd0cb1848 SHA-1: 868a9fbf0d88de16599d361f05abf5147a5c6c4b SHA-256: e42c21defc77817fc42c2aabdf0fa76060991626044379ca8b0a79ace72b7da9
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://noxsun.com/jingkelun/userfiles/files/20210626055332.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd369d7623f---70139173726.pdf
    • https://mszukam.pl/dat//file/mavobibimu.pdf
    • http://edumedcare.pl/upload/files/73084214983.pdf
    • https://ludifrance.fr/userfiles/file/44812374936.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0221998985---81028011015.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6180d44ad---76350880894.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e89ae16d---68718509802.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97386dbf27ab081afe771f3c07c9f3da/rubozogomukejamogob.pdf
    • http://apluskleaning.com/admin/images/file/17390433922.pdf
    • https://aduanaldelvalle.com/userfiles/file/90830387660.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da047dbed44---tizejobawoxi.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ea5cfb3a---xenemelixun.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075330583210---lowajevamewuxululemuva.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/tibototokeguwibafenom.pdf
    • http://kengosushionlineorder.com/uploads/files/51210876116.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c6f14b9e68d0a93f89f636ecfebc8eb8/xibodelowifejezisug.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c942c7b9c7---gojakupe.pdf
    • http://slhs1958.com/clients/18590/File/pifiv.pdf
    • http://goref.ru/files/file/99277932380.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/gesibajomosomozadunulon.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de729c899---soxolorave.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2a42d3a6---86896548224.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=japanese+name+that+means+black
    • 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_off0000da26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 16792 bytes
font_01_sfnt_off0000f23d.bin
c2a0b40d2a2254ba499d14db85067945e49fced6ff9a93ec1295fc04dd8655bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10548 bytes
font_02_sfnt_off000109e4.bin
e30118f088dc980d8aef2b3a3ab46f2defe5a4dd49c3aa11de031836687171df
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16828 bytes
font_03_sfnt_off00013530.bin
afc15fedd3a7b621ee8e182aba1fc6b9b698c47e37ad1b8db13d12e90af6c74a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 5816 bytes