Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa75561438bfdea…

MALICIOUS

PDF

78.1 KB Created: 2021-07-07 20:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa5bb115748884aa5dc9f0fb50bdf2e4 SHA-1: 9967d6c38f55f54d3ce96c2a0c05e4c689c14ba6 SHA-256: daa75561438bfdea9e75f76f6df269a8f80ffb9e47f6bfe5573b3f1fd6cb0b9b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the high number of external links pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to a malicious site, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=pcos+diet+book+free+download
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/25131d40456a72cacff6835b5e16d088/74064020506.pdf
    • http://amandamaitland.com/images/file/zasuzeravi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97cd32c61b---48460342177.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/44067552622.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/5ab242a76c0b1e11fb7bf1f91c1334ca/lexagileg.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f9697f2142f59a47e3cb4b5b90a672bc/gulababuwumexerazem.pdf
    • http://nickels.design/ckfinder/userfiles/files/zujon.pdf
    • https://armagedonspedycja.pl/files/file/74588244672.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c562cfb4ca4---29516181772.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdecca9962---lerajumijalupusanunikaja.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f417c565c---30184143844.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/2670906425.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kojimabasan.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1f92a6e5c92b724bab4f545aa6b7981d/791875241.pdf
    • http://bmcnx.com/userfiles/file/fasefomuse.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c1530564---goduribeba.pdf
    • http://bhs1966maui.com/clients/64750/File/likotibununutiridomejuloj.pdf
    • http://provia-events.de/pics/fotos/1/file/gatesul.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/80057db770f08f6b3159dd85ef7a9752/59848531242.pdf
    • http://mesterek.net/tmp/97531032229.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e5af4568825b9a5240d23942bb6b3250/wikuwowiwixilak.pdf
    • http://kzlo.pl/fotki/fotki/file/79789902316.pdf
    • 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_off0000cd81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 16792 bytes
font_01_sfnt_off0000e593.bin
6e5955f5d96c3e1da2b1af24b7c72ac596d9683cac4a679028d5c77a110b4f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 17184 bytes
font_02_sfnt_off00011272.bin
7343d1a2e4132ce24ec3f85117eea7eb627bdf5a4313152a07872e49aecaed05
pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 10788 bytes