Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd8272f0cd8ed88…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99b0e544618d83c9285fdd15c109bc2b SHA-1: 5271511df8ecb929bdd2d27a39c22c095c7e0bc8 SHA-256: 8dd8272f0cd8ed88a2797fe44c3672b172aa78225ff0205e50aa1c4c9782f7b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised websites, suggesting it's used to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dobre-akce.cz/media/files/file/37867578793.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdf
    • http://langeline.com/ckeditor/upload/files/82374007194.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/jusojegegejuk.pdf
    • https://balaji-technology.com/userfiles/file/juwowawujex.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f62486bfa---wixapikubutixepurap.pdf
    • http://weilandvloeren.nl/fckimages/ruwunudos.pdf
    • https://ebooksweb.net/files/file/51446162404.pdf
    • http://zatexpress.com/upload/userfiles/files/84570147872.pdf
    • https://jasz-pap.hu/UserFiles/file/53862541360.pdf
    • http://rencontres-icare.org/userfiles/file/69584672034.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lg2k6dskllv2sbb196jvj9akj0/zuviwodubukularifeja.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad33ef13d---40803513816.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tc955lb7tjvos391akqkeeeqc0/ragubujefemabajesimunuf.pdf
    • http://retco.ge/ckfinder/userfiles/files/ragulamufufexogozasifoluv.pdf
    • http://bienbao.org/uploads/files/22126591583.pdf
    • http://sz-nuoyi.com/Upload/file/2021091813490736449.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/78010261847.pdf
    • http://charivne.info/images/file/64255397646.pdf
    • http://gyermekhaz.hu/Content/site_images/files/pofezava.pdf
    • http://aesg2edcv.handylover.com/upload/files/48097483016.pdf
    • http://albino-pitti.com/pub_img/file/98067114714.pdf
    • https://mimpishio2.com/contents/files/besal.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/wusumisenefod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=amar+y+desear+full+movie+online
    • 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_off0000ba8c.bin
a210a6a9dac30bcc97b2dbfff740dcf463ae8168cff64018b59f8dd928a26f07
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8C 17760 bytes
font_01_sfnt_off0000e87d.bin
1e889f44a44f4b12e7f286154c1f4a28a6db5cb44a58bb27af35788167c809c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 10676 bytes
font_02_sfnt_off000100ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes