Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1eb6dacf1ea496…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba771bcd5da73f877bc37da3fe237a12 SHA-1: 7d7dcd859545375015fcefd60b47c770f39353dd SHA-256: 1c1eb6dacf1ea4960775ce7541aae9d657800690309e40f83a8786c38c4c7225
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and social engineering attack. The 'SE_CLICKFIX' heuristic indicates the document likely contains instructions to trick users into running commands, potentially to download and execute a second-stage payload. While no scripts were directly extracted, the presence of numerous external URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or spamming campaign.

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://laborke.ru/uplcv?utm_term=find+android+settings PDF link annotation
    • http://tinavaron.com/ckfinder/userfiles/files/55518067011.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/visoradojunitawisoz.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/fazirujunebonatomuwa.pdfIn PDF document text
    • http://jackyrouxmethode.com/userfiles/file/74472170132.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vesonomejezuwajafan.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/28786437277.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f19e7968eea96e35d4cbdadfd6e4ac28/vopulanujakaromobasarugi.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jazexerufaza.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/23403947152.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kugilel.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/pufesamazikonux.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/36733813319.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/dugukuwugafuvor.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ee905d4c---1545988088.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07a919a4a---salufosomako.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/lagabelolubomedawe.pdfIn PDF document text
    • http://anm-av.de/uploads/files/sekarasonesikifuja.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/tipifitarofavidavelejov.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021911132991521.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/gavulit.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/votodogopoponikekejevure.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/lenitatasaveroxejuxiz.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/jetulutifiwobewavap.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/didebapamisatutafor.pdfIn PDF document text
    • 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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 18624 bytes
SHA-256: 12a8b010b5a1086eb7f32aff43d7e67c61fc3db326a95c94d1d224d456885714
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 10352 bytes
SHA-256: 7f25b615443df1f77886ea12627c8e2c20238722bb3e63709162dffdad5b5961
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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