Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c412ed67f47eb7…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 05:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab871e6442ffe05385b0f2ebc76f19ed SHA-1: 8c31e1eb79077769a59378b7874356959c4be112 SHA-256: 74c412ed67f47eb79e4723e2529dba4b5bac2ac61ef9bc484fda2ad6e7e8b7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 6

  • 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 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://aeternoplanning.com/ckfinder/userfiles/files/51658744652.pdf In PDF document text
    • http://lucavolpicella.it/userfiles/files/14252449368.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/56684390903.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o8tu6215nu462ag3c7af2vl5pp/faxepepi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6e7f7dcddaa2413077991826e11e7ccc/nogob.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/72928155820.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/karodikofinorom.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160947cebad929---gewiduvig.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wamasutomabudi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/96720662510.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/fopakobirasesavotev.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d5fa45d095ee237852be088aa74b10/77966869906.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/47405142643.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2f91a989945e11ffba646409ca1643d3/midosiwuwiberi.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/22171199128.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g0ojflfi95unit9k1ckv6294iv/vudexelusanupoximekotu.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/93802070358.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/65fc55be2b8518b5bed78542b0874418/7985067192.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/durum.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jubanasomawetepurawi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/fubuxofufevafigup.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5cda6119a8kntvvq3mnqod36m3/timumovitanujobija.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/87327101189.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2ad28ac9---92209402599.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/sosutesedelomutupax.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0ic9o7vaehhr3j9sma90h4lipo/90672744874.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ebb6c04afe29e451bb2b6caf189356c3/fipigenimojaribuxagelumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D8%AA%D9%86%D9%85%D9%8A%D8%A9+%D8%A7%D9%84%D9%85%D9%88%D8%A7%D8%B1%D8%AF+%D8%A7%D9%84%D8%A8%D8%B4%D8%B1%D9%8A%D8%A9+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000cb6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB6F 24688 bytes
SHA-256: b184011a200e38ea98f5aa7a169aa577f62df7b664ed974763258530cfd9df76
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 18604 bytes
SHA-256: 21be49c963aee83c165a024f80ac783b105195a1313a4006d5e60768f0f4dc11
font_03_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 18884 bytes
SHA-256: 0fa21cb2b03ee0b27c3dc91f2fcba60361d84d56b92f72286b261621980b3718