Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7512f6ea915daf2…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 05:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc109cc14276343529baab8099c03348 SHA-1: 05e60c97680e3ef1901210c06594dca8cae05c34 SHA-256: a7512f6ea915daf25f38472215d1a4819848732fa1d0b68104ab3842ee46ad5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4332874ec---76688327998.pdf
    • https://dacinsara.ro/fckfiles/file/bininumofegad.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6454dd3f75912f3d280759fbd5dcd938/xokiwulisakowefobisu.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a523971ce77---judizilunorisar.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607056d737735---85667427462.pdf
    • http://kzlo.pl/fotki/fotki/file/70018673462.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077670214529---palorazodexefuxoposoguxu.pdf
    • http://pamat.ro/UserFiles/file/94997620349.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e11edf23cc047872f55b3457e91ebc74/65111971989.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad6d0e68e---53026646529.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/31635b0d1e29d2ac3685a5937f623ef1/gobonexe.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa472a03c5---musikunegu.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070189bc9a89---lefiziripeji.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/maan936c4qpie4rlk2hh9s0v05/37691615496.pdf
    • https://stratasphere.online/userfiles/file/72728577110.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608433ad882dd---54600780467.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/86cfaab9edc3543b481000bd84b44174/pixibezilutuzuwebimufozi.pdf
    • https://volnynaklad.cz/data/file/9434840720.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/75528551004.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1o606v6oe1ql5o31nae1s73kb7/8556326599.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/38e6fee28a2defa9c9f16d3dea68a24e/45579736950.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ec2e14f6---fepidugerutuf.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e338d4cc2d---67736541740.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b364b927cd---dikujaxobaf.pdf
    • http://meskerjager.nl/media/files/zuzadudufu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=transgender+child+before+and+after
    • 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_off0000ee12.bin
916aa2acfd0b5718ee2af9fd843f59bfb2b05487f9ae25716ff762e57f3bfb03
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 17320 bytes
font_01_sfnt_off00011b25.bin
1d245ee5707f6c9dc941a34d4d8d5c0581f5d9931746eb05530d93de89eef7ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 10860 bytes
font_02_sfnt_off000133e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 16792 bytes