Malicious PDF — malware analysis report

Static analysis result for SHA-256 43baedc4c48f2c6f…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 21:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2818b709d0349dc9ba271fabf0514e7 SHA-1: a9a6d2ae2c12db4a0e4bac03527cecf2a74d94f0 SHA-256: 43baedc4c48f2c6f1e9dec2fbdc3555de611e09c06c66a92265ac7373b207891
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vovn6guper4se27ncs3r9udg69/jurenoxekukexalugu.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-16/20210616163007342219.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eda85fdf2---89166589500.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609289c616eab---73322256867.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be32409f4---tetinakufuwudigalituzoj.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1bbc9316c879bfed8429c5c5b2494a74/97262722638.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/50tj9ok9vihjouj1tn6ij6evuu/wijemolapitosew.pdf
    • http://pphu-joanna.pl/fckpliki/file/17419237931.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/043b502e9f1843f5ec1aee0ee1ba209c/wisativeguwuzegap.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0b8270d5---22580240733.pdf
    • https://actor-conseil.com/files/file/fumobalamixakebolitekafo.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3aeb0741a7e6a3b2b9c0d484cf2918c0/35166035637.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bc005ae3969cfcf9adcb22311f7bed0a/loreropovotosipuwerawi.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d99137f03aaf1750d97a50b23ec8f480/65029651457.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/40516056603.pdf
    • https://acronimocostanzo.com/userfiles/file/95266575220.pdf
    • https://viettincapital.vn/upload/files/pukugumesazebobug.pdf
    • http://epoxidice.ro/mm/file/10084332640.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072a939ad851---gukoligufupoduwuranazaze.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6547f8d12c3a932eba3e39bd636ab3b6/32870849156.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/bcd622052b0484b921bea359a651c5a3/razaginopelor.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/b33d7afbeea4636bb49d9dcfd42009d7/18123731354.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/22312cdd69d2f1b087888ca77b6cba9f/ragisuzut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=maths+kcet+2019+solutions
    • 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_off0000eecd.bin
f75a6f8f4e16177475c3df57774fe0796e6d83b711ef0f85ad6d578f47eaafc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10872 bytes
font_01_sfnt_off00010806.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 16792 bytes
font_02_sfnt_off00012018.bin
aeba2c7b21731dcb03096fe4de30e975c0b60cd05803942bf22fe49afdc10c66
pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 17996 bytes