Malicious PDF — malware analysis report

Static analysis result for SHA-256 97591f7f8ca8c052…

MALICIOUS

PDF

87.4 KB Created: 2021-07-31 12:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db38a7e335de501cac3411d7b125bb8a SHA-1: 6373462b5ca2356afaa3cc0d396f980a0ce124f8 SHA-256: 97591f7f8ca8c052ea7718e79ba70a91744b2e2645e9503239169e2860171099
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lotusburbank.com/uploads/files/19756926369.pdf
    • http://av72-reklama.ru/userfiles/file/16266958800a6da12dc02239312f15.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/putegutejejatefalabaxom.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2ad6d7501b7d0d6d0ecbe995365fe4df/peziwe.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/09u7ekaue6edrgnrvg215lhq0q/kamaw.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7d58e8b888f4ed7d5e4f2dee143eea59/66992335965.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/fijik.pdf
    • http://fd-health.com/upload/ckeditor/files/61366899505.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4664bc9c9---34949339582.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cbe303e3d105ed6c4526a80bb1f8b9a1/75560541345.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7eb7d913d765eacb5886bc792625b53e/zoxilosudumekazetufiteta.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6f27jmakl3j5rh0j9gndjs3cv6/dizadojuvedogexogiwut.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160841736f23ef---6805791616.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/xawidizanatebinuk.pdf
    • https://ceccargiurgiu.ro/userfiles/file/nolozemazavew.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3ff5163b91a22471f9d2f3805b7bbe66/32379211987.pdf
    • http://blbr365.com/userfiles/file/1621746996.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/nunarivoxuvevaronelasa.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/70022364602.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/50303568311.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a9acedf57---tesago.pdf
    • http://tetraeng.it/userfiles/files/bebususekod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=max+payne+3+reloaded+social+club+login+fix
    • 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_off0000ec62.bin
57f2d01daffa701869b52432fc13ce15c43d8ba082f50404fe584428ac749bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 19476 bytes
font_01_sfnt_off00011d33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 16792 bytes
font_02_sfnt_off0001354a.bin
5bdbbf3cff6bbfd767bc97dd03b149bb22bb8c5dda7d77904fac0820503e2d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354A 11316 bytes