Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70ac657f363cdf1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 17:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f482bdadd1ff4629c77c37557aa22966 SHA-1: 92e2b63b2cf000efd9a4c519f2bbf53fa1bcfe90 SHA-256: e70ac657f363cdf1f60ad37992ff2746f1e6e5e4ac25cd3a023919865ef72ab0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, characteristic of phishing or malware distribution schemes. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obfuscate the final destination and track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=ikey+android+button PDF link annotation
    • https://goldgreiner.de/userfiles/file/17183449105.pdfIn PDF document text
    • http://yoron.net/up/files/kosatibukafufazojevonim.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8a1f713e5086099b1ea7af4615f211db/gijigano.pdfIn PDF document text
    • http://dr-temt.ru/images/file/44780103363.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/96521510695.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/feluxopatasofij.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/94636063604.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bt69657itcs2n07mcil4bspn79/lopegopijigelutoge.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/mutowusakuzifipefes.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/moziwebebukaduriligukus.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/23622221697.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/73939318142.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/23099334111.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/39984863327.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/61414781107.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/doxajikevezexojupujagu.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/84225555240.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/77882559384.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/50449146799.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/23025604022.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/dades.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c78bb52ff---30927240718.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/zenewepevikaxopoxi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/346f8512480a707ec1ec55e423e45adc/ralumabapuzawufilafip.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kilel.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 18396 bytes
SHA-256: 35b8ac880358e57da2025c9386eea02ee4a1ca53782356c60a6a0ef6ce1e8a0a
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 10424 bytes
SHA-256: e077f1123c9f971d8353ca324667f15be1d6b65361e7faae52d35974f084d433
font_02_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 21040 bytes
SHA-256: 57e7afa12a0b8359f2d072f398c2168b14cfa14aec76de1666db323f8c600c7a

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