Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b80f3c41ca0c9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 09:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8a916dbe5a2e6fb0994dd6af692a9f7 SHA-1: f6418c9c5bf23376039bdf47164c3ad4d5f401de SHA-256: b77b80f3c41ca0c979a938322ec85837862899b430ef919b7827e48d0fb7c753
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload directories and raw IP addresses, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/emts1ijo3hbkkg03tkq18d0qf1/fonemipifexoxutusebebemi.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b276650248d---fugovef.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/70694009259.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f2d5f6f96c4d0151b15c3185254e885b/43980506039.pdfIn PDF document text
    • https://xistenze.com/files/files/forabikudoxajotupanadul.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6304a0652---migikazuteribusorizog.pdfIn PDF document text
    • http://aplus.to/userfiles/file/39628138110.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/datubunaxapizoligurokozoj.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/88cf1a8c77d0d186f77b86459ca07456/lixil.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/48052197322.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aehnmduv266orlenn3vukll4fp/4617448490.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607680ed58830---89197590668.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5qdfg5jvuenp0jlgct82od66j0/8717345038.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/ditekopemivugele.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21b70fda7---45692175431.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/ninolazuduxexopis.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d993b550c17---fuxibelonapebiputirajos.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/gukuwelerawogiponedibe.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/43169880527.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fifesufejojojego.pdfPDF link annotation
    • http://yizhu580.com/ckfinder/userfiles/files/7377142037.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mqorgigefql0b4sfes2aldjo32/xaxusovijusitunoxuf.pdfIn PDF document text
    • https://cecprint.com/images/file/jagex.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/63200570857.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70e67601c---tusifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cursive+handwriting+ks2+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 17024 bytes
SHA-256: 78ce6b556a348ca159f5af69bd328123b38751aff5bdafc9b5f57aaacbe9e46a
font_02_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 10976 bytes
SHA-256: d33b8742b7dfc9f0a26d09e2f6959706ce0679aee0b1fd23b5d0a44d3ce036ab