Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc316a358c3b47f2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 32c771db6c7a0f53b4d46c3ce7d9abfa SHA-1: 4c171658ab503b12e8deab377e486cb317f678b7 SHA-256: fc316a358c3b47f2244413c10e6e2d10a96e3e5c109145861025d0a3b10a57ea
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://banphimchuot.com/userfiles/file/28376693140.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/naravujaxejerikexokez.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/cb8d81f0ae1a88ec36cb8e5a74487272/puvesidefimabuke.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9d86a7pdkoo9gsfvemehq0chn7/leruvemakewogogesup.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0be5bcdc7---ropigaxigadesedo.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vefefogimu.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/jifevifilejosujapowofem.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/49182577897.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/99815082138.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/pozolowatafutewexew.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/palru1eo98rae0toemncdkg9l4/dukotexagirujupap.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf504eb19a---mosuvivuzamuzirumu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9fa0bcbde852ff3eb4e5814adadf461/tavetevet.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997accc5d8---33287077645.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wifefudojojetoxebavone.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b57658fb2---waxuxepapup.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/lizuduvupipirowadomonavez.pdfIn PDF document text
    • https://olterus.org/contents/files/vugawigutajosu.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/66332872721.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/45759463797.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/jusiposijezojigerugudib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isro+recruitment+2019+for+engineers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 18336 bytes
SHA-256: d3f235f718de6594a480bf33db86083678f44594893bb35d9928c0a4291e6fbd
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 11268 bytes
SHA-256: 56c39f0cc988baaa7a17f6c15800424b2516712a945fa5ea4c2667c9ad522375
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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